lectures (10h30 - 12h30) - 23/04/12 filelectures (10h30 - 12h30) - 23/04/12

1

Lectures (09h - 10h) - 23/04/12

Lecture: Kovchegov ICoordenador: Magno MachadoLocal: Salao Chardonnay

09h00 High energy QCD: evolution equations and particle productionYuri Kovchegov (The Ohio State University, USA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Lectures (10h30 - 12h30) - 23/04/12

Lecture: Lipari ICoordenador: Cristiano MariottoLocal: Salao Chardonnay

10h30 Cosmic Rays and Hadronic PhysicsPaolo Lipari (INFN and Dipartimento di Fisica University of Roma, Italy) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Lecture: Typel ICoordenador: Celso BarrosLocal: Salao Chardonnay

11h30 Clusters in Nuclear Matter and the Equation of State for Astrophysical ApplicationsStephan Typel (GSI Helmholtzzentrum fur Schwerionenforschung, Germany) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Talks (15h - 17h) - 23/04/12

Talks - Session 01Coordenador: Fabiana CarvalhoLocal: Salao Chardonnay

15h00 Momentum space dipole amplitude for DIS and inclusive hadron productionM.B. Gay Ducati (Instituto de Fisica - UFRGS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

15h30 Multi-particle production in the CGC frameworkCyrille Marquet (CERN - Theory Division, Switzerland) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

16h00 DVCS at an eRHIC: towards a high resolution partonic imagingSalvatore Fazio (Brookhaven National Laboratory, USA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

16h30 Exclusive electroproduction of vector mesons: from high to low energyLaurent Favart (Universite Libre de Bruxelles, Belgium) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2 XII HADRON PHYSICS

Posters (17h - 17h30) - 23/04/12

Posters - Session ACoordenador: Jose Carlos OliveiraLocal: Poster Room

P001 Heavy quark production in photon-Pomeron interactions at high energiesVictor Paulo Barros Goncalves, Mairon Melo Machado (IFM - UFPel - Brazil) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

P002 Exclusive processes in electron-ion collisions in the dipole formalism.Erike Cazaroto (USP - SP - Brazil), Fernando Navarra, Fabiana Carvalho, Maria Kugeratski, Victor Goncalves . . . 17

P003 Hadronic thermal model with two freeze-out temperaturesS.B. Duarte, L.P.G. de Assis, M. Chiapparini (UERJ - RJ - Brazil), L. Hirsch, A. Delfino . . . . . . . . . . . . . . . . . . . . . . . . . 17

P004 Medium effects and jet fragmentation at the LHCSony Martins (FURG - RS - Brazil), Cristiano Brenner Mariotto, Luiz Fernando Mackedanz . . . . . . . . . . . . . . . . . . . . . . . 17

P005 Nuclear effects in squark production at the LHCCristiano Brenner Mariotto, Marcos Cardoso Rodriguez (Universidade Federal do Rio Grande (FURG)), Danusa BuenoEspindola . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

P006 Thermal Dileptons as a Baseline for Thermal Quarkonia for LHCFabio Kopp Nobrega (Universidade Federal do Rio Grande - FURG), Luiz Fernando Mackedanz . . . . . . . . . . . . . . . . . . . . . . . . . 18

P007 Cold matter effects and quarkonium production at RHIC and LHCGlauber Sampaio dos Santos (Universidade Federal do Rio Grande (FURG) - RS - Brazil), Cristiano Brenner Mariotto, VictorPaulo Barros Goncalves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

P008 Electron-Hadron correlations in p+p collisions at√s = 2.76 TeV in the ALICE experiment

Elienos Pereira de Oliveira Filho ((for the ALICE Collaboration) Nuclear Physics Department, Universidade de Sao Paulo

Sao Paulo, Brazil) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

P009 J/Ψ Measurements in 7 TeV p-p collisions at ALICE using EMCal-triggered eventsMarcel Araujo Silva Figueredo (Universidade de Sao Paulo),for the ALICE Collaboration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

P010 Polarization effects at RHIC and LHCCelso de Camargo Barros jr. (Universidade Federal de Santa Catarina) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

P011 Producao de duplo boson Z como teste de dimensoes extrasWerner Sauter (UFPel), Victor P. B. Goncalves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

P012 Three-body model for the final state interaction in heavy meson decayT. Frederico, K.S.F.F. Guimaraes (Instituto Tecnologico de Aeronautica), W. de Paula, O. L. S. Filho, I. Bediaga, A. C. dosReis, P. C. Magalhaes, M. Robillota . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

P013 Obtaining the strong coupling constant gJ/ψDsDsfrom QCD Sum Rules.

B. Osorio Rodrigues (UERJ - RJ - Brazil), M. Chiapparini, M. E. Bracco . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

P014 Hadron production at LHC in dipole momentum spaceEduardo Basso (IF - UFRGS - RS - Brazil), Maria Beatriz Gay, Emmanuel de Oliveira . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

P015 Non-linear QCD dynamics in two-photon interactions at high energiesFabiana Carvalho (Universidade Federal de Sao Paulo - UNIFESP), Fernando Navarra, Victor P.B. Goncalves, Eric Cazaroto 21

P016 Hadronic Cross Sections, Elastic Slope and Physical BoundsD.A. Fagundes (Instituto de Fısica Gleb Wataghin, Universidade Estadual de Campinas - UNICAMP, 13083-859 Campinas, SP, Brazil), M.J.Menon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

P017 Hadronic Differential Cross Section Data and the Tsallis DistributionD.A. Fagundes, M.J. Menon, P.V.R.G. Silva (Instituto de Fısica Gleb Wataghin, Universidade Estadual de Campinas - UNICAMP,

13083-859 Campinas, SP, Brazil) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

P018 The effective mass of the pions in a hot mesons matter.F.J. de Almeida Gama, C.A.A. Izidorio, R. Rodrigues da Silva (Universidade Federal de Campina Grande), E. Cunha . . . 22

P019 High Density Effects in the Dilepton Production in Cosmic Ray InteractionsRosalia Kruger de Castro (UFPel - RS - Brazil), Victor Paulo Goncalves, Marcos Andre Betemps . . . . . . . . . . . . . . . . . 22

XII HADRON PHYSICS 3

P020 Relation between Tcc,bb and Xc,b from QCDJorgivan M. Dias1 (1 Grupo de Hadrons e Fısica Teorica, Instituto de Fısica, Universidade de Sao Paulo; 2 Laboratoire Particules et Univers

Montpellier; 3 Institut de Physique Nucleaire de Lyon, Universite de Lyon), Stephan Narison2, Fernando Silveira Navarra1, MarinaNielsen1, Jean-Marc Richard3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

P021 Inclusive production of dijets at the LHeCMaria Beatriz de Leone Gay Ducati, Mirian Thurow Griep (Universidade Federal do Rio Grande do Sul - RS - Brazil), MagnoValerio Trindade Machado . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

P022 Production of the mixed molecule-charmonium X(3872) in B decaysC.M. Zanetti, M. Nielsen, R. D. Matheus (IFT - UNESP - SP - Brazil) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

P023 Bound states in a glueball-glueball potentialCarla Novello (UNIPAMPA - RS - Brazil), Mario Luiz Lopes da Silva . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

P024 Meson production in two-photon interactions at LHC energiesVICTOR PAULO BARROS GONCALVES, WERNER KRAMBECK SAUTER, DANIEL TAVARES DA SILVA(Instituto de Fısica e Matematica, Universidade Federal de Pelotas - UFPel - RS - Brazil) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

P025 Photoproduction of scalar mesons at medium energiesM. L. L. da Silva (UFPel - RS - Brazil), M. V. T. Machado . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

P026 pp Scattering at the LHCAnderson Kendi Kohara (Instituto de Fisica, Universidade Federal do Rio de Janeiro), Erasmo Ferreira, Takeshi Kodama . . . . 24

P027 Relating the nuclear structure function and diffractive scatteringFabiana Carvalho, Victor P.B. Goncalves, Fernando Silveira Navarra (IFUSP), Emmanuel Grave Oliveira . . . . . . 24


Talks (17h30 - 19h30) - 23/04/12

Talks - Session 02Coordenador: Ricardo FariasLocal: Salao Chardonnay

17h30 Highly-anisotropic and strongly-dissipative hydrodynamics and the early-thermalization puzzleWojciech Florkowski (Institute of Physics, Jan Kochanowski University and H. Niewodniczanski Institute of Nuclear Physics) . . . . . . . . . . . 24

18h00 Event-by-event hydrodynamics: a better tool to study the Quark-Gluon PlasmaFrederique Grassi (IF USP, SP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

18h30 Self-consistency in non-extensive thermodynamics of highly excited hadronic statesAirton Deppman (Instituto de Fisica da Universidade de Sao Paulo) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

19h00 Thermal Bottomonium SuppressionMichael Strickland (Gettysburg College, Physics Department) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25


Lectures (09h - 10h) - 24/04/12

Lecture: Petreczky ICoordenador: Dimiter HadjimichefLocal: Salao Chardonnay

09h00 QCD at non-zero temperature : status and prospectsPeter Petreczky (Brookhaven National Laboratoty, USA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Lectures (10h30 - 12h30) - 24/04/12

Lecture: Kovchegov IICoordenador: Victor GoncalvesLocal: Salao Chardonnay


Lecture: Lipari IICoordenador: Cristiano MariottoLocal: Salao Chardonnay


Talks (15h - 17h) - 24/04/12

Talks - Session 03Coordenador: Emerson LunaLocal: Salao Chardonnay

15h00 Chiral Quark Models with Polyakov loops at finite temperatureEnrique Ruiz Arriola (Universidad de Granada, Spain) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

15h30 Chiral symmetry breaking with a confining propagator and dynamically massive gluonsAdriano Natale (IFT - UNESP, SP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

16h00 Lattice gluon propagator and deconfinementAttilio Cucchieri, Tereza Mendes (University of Sao Paulo) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

16h30 Electric Dipole Moments of Light Nuclei from Chiral Effective Field TheoryJ. de Vries, R. Higa (Instituto de Fisica, USP), C.-P. Liu, E. Mereghetti, I. Stetcu, R. G. E. Timmermans, U. van Kolck 28


Posters (17h - 17h30) - 24/04/12

Posters - Session BCoordenador: Celso BarrosLocal: Poster Room

P001 Renormalization of the Brazilian Chiral Nucleon-Nucleon PotentialCarlos Antonio da Rocha (Universidade Sao Judas Tadeu - USJT-SP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

P002 Reliability of the Optimized perturbation theory for scalar fields at finite temperatureRicardo Luciano Sonego Farias (UFSJ-UFSJ-UERJ), Daniel Lombelo Teixeira Junior, Rudnei de Oliveira Ramos . . 29

P003 Electromagnetic Structure of the Meson PionJose de Paulo Cruz Filho (LFTC, Universidade Cruzeiro do Sul - SP - Brazil), Clayton Santos Mello, Edson Otoniel da Silva, J.P. B. C. de Melo and Victo S. Filho . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

P004 Chiral Symmetry in a Hot and Dense Magnetic MediumGabriel Neves Ferrari (Departamento de Fısica, Universidade Federal de Santa Catarina, Florianopolis, Santa Catarina, Brasil), MarcusBenghi Pinto . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

P005 Emergence of Multiple Critical Points in the NJL Model with Vector CouplingRobson Z. Denke (Departamento de Fısica - Universidade Federal de Santa Catarina), Juan Camilo Macias, Marcus Benghi Pinto 30

P006 A heuristic approach for accessing and employing the infrared behavior of Yang-Mills correlationfunctionsFatima Araujo Machado (IFT/UNESP - SP - Brazil), Adriano Natale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

P007 Long Distance Symmetries for Nuclear Forces and the Similarity Renormalization GroupSergio Szpigel (Centro de Ciencias e Humanidades, Universidade Presbiteriana Mackenzie, Sao Paulo Brasil), Varese Salvador Timoteo,Enrique Ruiz Arriola . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

P008 Non perturbative description of self-interacting charged scalar field at finite temperature and in thepresence of an external magnetic fieldDyana Cristine Duarte (Universidade Federal de Sao Joao del Rei), Ricardo Luciano Sonego Farias, Rudnei de OliveiraRamos . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

P009 Quark loop effects on the gluon propagatorArlene Cristina Aguilar (Universidade Federal do ABC), Daniele Binosi, Joannis Papavassiliou . . . . . . . . . . . . . . . . . . . . . . . 31

P010 The decay constant and mass of the ρ meson in self-consistent QCD Sum Rules.Mikael Souto Maior de Sousa (Universidade Federal de Campina Grande), Romulo Rodrigues da Silva . . . . . . . . . . . . . . . . . . 32

P011 The decay constant of the ρ(2S) mesonMikael Souto Maior de Sousa (Universidade Federal de Campina Grande), Romulo Rodrigues da Silva . . . . . . . . . . . . . . . . . . 32

P012 On the possible effects of gluon number fluctuations on γγ collisions at high energiesV. P. Goncalves, J. T. de Santana Amaral (Instituto de Fısica e Matematica, UFPel - RS - Brazil) . . . . . . . . . . . . . . . . . . . . . . . . . 32

P013 Short-time dynamics of nonextensive gluodynamicsRafael Bertolini Frigori (UTFPR), Antonio Mihara . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

P014 A MAG–Landau interpolating gauge for Yang–Mills theory on the latticeAntonio Mihara (UNIFESP/campus Diadema - SP - Brazil) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

P015 Potential Model for Heavy Quarks using Gluon Propagators in Landau Gauge obtained from latticesimulationsWillian Serenone (USP - SP - Brazil), Tereza Mendes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

P016 Study of the Z(3) symmetry breaking of an effective Polyakov loop model using a worm algorithmGastao Krein, Rafael Leme (IFT Unesp - SP - Brazil), Marcio Woitek . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

P017 Nucleation of Quark Matter in the PQM ModelBruno Werneck Mintz (Universidade Federal do Rio de Janeiro), Rudnei de Oliveira Ramos, Rainer Stiele, Juergen Schaffner-Bielich . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

P018 Investigation of chiral broken and existence of strange quark stars within the Nambu-Jona-Lasiniomodel with vector repulsionJaziel Goulart Coelho (Instituto Tecnologico de Aeronautica - SP - Brazil; Universidade de Coimbra - Portugal), Constanca Providencia,Manuel Malheiro . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34


P019 Phase Transitions in Quark Matter under Strong Magnetic FieldsAndre Felipe Garcia (UFSC - SC - Brazil), Gabriel Neves Ferrari, Marcus Benghi Pinto . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

P020 The Symmetry energy of nuclear matter under a strong magnetic field.Rudiney Casali (UFSC - SC - Brazil), Debora Menezes, Constanca Providencia . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

P021 The neutrino escape and gravitational wave generation in protoneutron star coolingHilario A. R. Goncalves, Anna M. Endler (Centro Brasileiro de Pesquisas Fısicas - CBPF), Sergio B. Duarte, MarcelloChiapparini . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

P022 Hyperon-meson and delta-meson coupling to proto-neutron stars structureWellington Alencar de Souto, Jose Carlos Teixeira de Oliveira (Universidade Federal de Roraima-UFRR), Hilario Rodrigues,Sergio Barbosa Duarte, Marcelo Chiapparini . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

P023 A mean field theory for the cold quark gluon plasma applied to stellar structure.D. A. Fogaca (Intituto de Fısica, Universidade de Sao Paulo), F. S. Navarra, B. Franzon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

P024 Cold quark matter in compact starsBruno Cezar de Souza Franzon (Universidade de Sao Paulo - SP - Brazil), Fernando Silveira Navarra, David Fogaca . . . . 36

P025 Neutron stars matter and the symmetry energyRafael Cavagnoli (Universidade Federal de Santa Catarina - UFSC), Debora Peres Menezes, Constanca Providencia . . . . . . . 36

P026 Revisiting Pulsars and MagnetarsLuiz Laercio Lopes (Universidade Federal de Santa Catarina, SC - Brasil), Debora Peres Menezes . . . . . . . . . . . . . . . . . . . . . . . . . . 36

P027 HYPERON POPULATION IN HYBRID STARSRosana de Oliveira Gomes (UFRGS - RS - Brazil), Alberto Sperotto dos Santos Rocha, Cesar Augusto ZenVasconcellos . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

P028 Neutrino mean-free-path in dense homogeneous nuclear matterUbiratan Jose Furtado (Department of Physics - CFM - UFSC), Jose Ricardo Marinelli . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

P029 Study of the influence of a strong magnetic field on the composition of nuclear matter at highdensities and zero temperature.Eduardo Lenho Coelho (UERJ - RJ - Brazil), Marcelo Chiapparini . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37


Talks (17h30 - 19h30) - 24/04/12

Talks - Session 04Coordenador: Marcelo ChiappariniLocal: Salao Chardonnay

17h30 Search of CP violation in B charmless three body decaysIgnacio Bediaga (CBPF, RJ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

18h00 Charm and bottom hadronic form factors with QCD sum ruleMirian Bracco (Faculdade de Tecnologia, Universidade do Estado do Rio de Janeiro, RJ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

18h30 Deconfinement and chiral symmetry restoration in nonlocal chiral quark modelsDaniel Gomez Dumm (UNLP, La Plata, Argentina) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

19h00 Current quark mass dependence of the QCD phase diagram within non-local quark modelsV. P. Pagura (CNEA - Argentina), N. N. Scoccola, D. Gomez Dumm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38


Lectures (09h - 10h) - 25/04/12

Lecture: Typel IICoordenador: Ricardo FariasLocal: Salao Chardonnay


Lectures (10h30 - 12h30) - 25/04/12

Lecture: Kovchegov IIICoordenador: Fabiana CarvalhoLocal: Salao Chardonnay


Lecture: Petreczky IICoordenador: Dimiter HadjimichefLocal: Salao Chardonnay



Lectures (09h - 10h) - 26/04/12

Lecture: Typel IIICoordenador: Marcelo ChiappariniLocal: Salao Chardonnay


Talks (15h - 17h) - 26/04/12

Talks - Session 05Coordenador: Salvatore FazioLocal: Salao Chardonnay

15h00 Results from ALICEMateusz Andrzej Ploskon (Lawrence Berkeley National Laboratory, Berkeley, USA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

15h30 The PANDA-experiment at the future FAIR-acceleratorFrank E. Maas (Institute for Nuclear Physics - Johannes Gutenberg-Universitat Mainz , Germany) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

16h00 Baryon Spectroscopy at Jefferson Lab in the 6 GeV Era: What have we learned about excitednucleon states?Volker Crede (University of Florida, USA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

16h30 Renormalization methods for the nuclear forceVarese Salvador Timoteo (Faculdade de Tecnologia, Universidade Estadual de Campinas, SP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Talks - Session 06Coordenador: Enrique ArriolaLocal: Salao Chardonnay

15h00 Latest results from the Pierre Auger ObservatoryVitor de Souza Filho (Instituto de Fisica de Sao Carlos, USP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

15h30 Molecular Aspect of Charm PhysicsF. Fernandez (Grupo de Fısica Nuclear and IUFFyM, Universidad de Salamanca, E-37008 Salamanca, Spain), P. G. Ortega and D. R.Entem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

16h00 Linear sigma model with vector mesonsGyorgy Wolf (MTA Wigner FK, Budapest, Hungary), Peter Kovacs, Denis Parganlija, Francesco Giacosa, Dirk Rischke 42


Posters (17h - 17h30) - 26/04/12

Posters - Session CCoordenador: Dimiter HadjimichefLocal: Poster Room

P001 Hamilton-Jacobi Formalism to Podolsky Electromagnetic Theory on the Null-PlaneM.C. Bertin, B. M. Pimentel, G. E. R. Zambrano (Departamento de Fısica - Universidad de Narino - Colombia) . . . . . . . . . . . . . 42

P002 Divergences of Generalized Quantum Electrodynamics on the Lorentz Gauge.R. Bufalo, B. P. Pimentel, G. E. R. Zambrano (Departamento de Fısica - Universidad de Narino - Colombia) . . . . . . . . . . . . . . . . 42

P003 A nonextensive statistical model for the nucleon structure function.Luis Augusto Trevisan (Universidade Estadual de Ponta Grossa), C. Mirez, Rosangela S. Bastos . . . . . . . . . . . . . . . . . . . . . . . . 43

P004 Advances os statistical/thermodynamcal model for unpolarized structure functionLuis Augusto Trevisan (Universidade Estadual de Ponta Grossa), C. Mirez, Lauro Tomio, Rosangela S. Bastos . . . . . . . . . 43

P005 Correspondence between the Self-Dual model and the Topologically Massive Electrodynamics: Anew viewB. M. Pimentel, C. E. Valcarcel (Instituto de Fısica Teorica , UNESP - Sao Paulo State University) . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

P006 The proton structure in the region of high xBFernando Navarra, Samuel Sanches (USP - SP - Brazil) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

P007 Simultaneous particle emissions in hot nuclei evaporation processLeonardo P. G. De Assis, Sergio B. Duarte (Centro Brasileiro de Pesquisas Fısicas), Bianca Martins Santos . . . . . . . . . . . . 44

P008 Heavy Quark Production in the Black Hole Evaporation at LHCV. P. Goncalves, W. K. Sauter, M. Thiel (UFPel - RS - Brazil) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

P009 Photoproduction of lepton pairs in proton-nucleus and nucleus-nucleus collisions at RHIC and LHCenergiesBruno Duarte da Silva Moreira (Universidade Federal de Pelotas), Victor Paulo Barros Goncalves, Joao Thiago de SantanaAmaral . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

P010 The final stage of gravitational collapse for high density fluid medium.Miguel Gustavo de Campos Batista, Rochelle Gomes de Souza (Physics Departament-Roraima Federal University) . . . . . . . . 45

P011 QUANTUM THEORY OF BOSONS AND FERMIONS CONDENSATIONAdriano Nogueira de Souza (LFTC- Universidade Cruzeiro do Sul, SP, Brazil), Victor Santos Filho, Joao P. B. de Melo . . . 45

P012 The dimensional regularization in light frontL. A. Soriano (Instituto de Fısica Teorica-UNESP), A. T. Suzuki, J. H. O. Sales . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

P013 The Lorentz transformation on the light front, is it possible?L. A. Soriano (Instituto de Fısica Teorica-UNESP), A. T. Suzuki, J. H. O. Sales . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

P014 Heavy Meson Spectrum in an Semi-Analytical approach to the Static Quark Potential RelativisticWave EquationAndre Luiz Mota (Universidade Federal de Sao Joao del Rei), Heron Caldas, Jose Erinaldo da Fonseca . . . . . . . . . . . . . . . . . . 46

P015 Z(N) Spin-Gauge Systems in the LatticeA. R. J. Barreto (Universidade do Estado do Rio de Janeiro - RJ - Brazil), M. Chiapparini . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

P016 Searching of Gravitational Waves Signals from Millisecond PulsarsFernanda Gomes de Oliveira (Instituto Tecnologico de Aeronautica), Rubens de Melo Marinho Jr, Jaziel Goulart Coelho,Nadja Simoes Magalhaes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

P017 The effect of the a confining propagator in TC modelsAdriano Doff Sotta Gomes (Universidade Tecnologica Federal do Parana - UTFPR - COMAT Via do Conhecimento Km 01, 85503-390, Pato

Branco - PR, Brazil), Fatima Araujo Machado, Adriano Antonio Natale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

P018 Search for high-mass dilepton resonances in 5/fb of pp collisions at sqrt(s) = 7 TeV with ATLASdetectorAndre Asevedo Nepomuceno (Universidade Federal Fluminense) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

P019 A light in the Dark Sector with a Stueckelberg extension of the Standard ModelAlexander Lunkes dos Santos (UFRGS), Dimiter Hadjimichef . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

P020 An alternative approach to exact solutions of time-dependent nonlinear Schrodinger equation withquartic and quintic nonlinearitiesLuis Enrique Arroyo Meza, Alvaro de Souza Dutra, Marcelo Batista Hott (UNESP-Campus de Guaratingueta) . . . . . . . . 48


Talks (17h30 - 19h30) - 26/04/12

Talks - Session 07Coordenador: Michael StricklandLocal: Salao Chardonnay

17h30 Fluctuations and the QCD phase transitionVolker Koch (Lawrence Berkeley National Laboratory, Berkeley, USA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

18h00 The QCD Phase Diagram Under Magnetic FieldsSidney S. Avancini, Debora P. Menezes, Marcus Benghi Pinto (UFSC - Universidade Federal de Santa Catarina), ConstancaProvidencia . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

18h30 Transient Relativistic Fluid Dynamics from Weyl InvarianceJorge Noronha (Instituto de Fisica, USP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

19h00 Dilepton resonances in proton proton collisonsYara do Amaral Coutinho (IF UFRJ, RJ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

19h30 Negative parity baryon decays in the 1/Nc expansionChandana Jayalath, Jose L. Goity, Emiliano Gonzalez de Urreta (Department of Theoretical Physics, Comision Nacional de Energıa

Atomica, 1429 Buenos Aires, Argentina; CONICET, Rivadavia 1917, 1033 Buenos Aires, Argentina), Norberto N. Scoccola . . . . . . . . . . . . 49

20h00 The Competition of Superconductivity and Chiral Symmetry Breaking in Quasi-Two-DimensionalDirac Fermionic SystemsLizardo Henrique Cerqueira Moreira Nunes (Universidade Federal de Sao Joao del Rei), Ricardo Sonego Luciano Farias,Eduardo Cantera Marino . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49


Lectures (09h - 10h) - 27/04/12

Lecture: Petreczky IIICoordenador: Cyrille MarquetLocal: Salao Chardonnay


Talks (10h30 - 11h30) - 27/04/12

Talks - Session 08Coordenador: Marcus Benghi PintoLocal: Salao Chardonnay

10h30 SGRs and AXPs: White Dwarf Pulsars versus Magnetarsmanuel malheiro (Instituto Tecnologico de Aeronautica), Jorge Rueda, Remo Ruffini . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

11h00 Deconfinement to Quark Matter in Neutron StarsVeronica Dexheimer (UFSC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Lectures (10h30 - 12h30) - 27/04/12

Lecture: Lipari IIICoordenador: Magno MachadoLocal: Salao Chardonnay


XII HADRON PHYSICS - 23/04/12 15

Lectures (09h - 10h)

Lecture: Kovchegov I

[23/04/12 - 09h00 - Local: Salao Chardonnay]High energy QCD: evolution equations and particleproduction, Yuri Kovchegov, The Ohio State Uni-versity, USA �In these lectures, we develop the theory ofevolution equations and particle production in the scope onQuantum Chromodynamics (QCD) at high energies. Thisis the matter made of gluons in the high density environ-ment characteristic of deep inelastic scattering or hadron-hadron collisions at very high energy. The plan of lecturestreating of aspects of high energy QCD is the following:

1. Brief review of high energy QCD/small-x physics.

a. Classical gluon fields, parton saturation.

b. The linear BFKL evolution.

c. Nonlinear BK and JIMWLK evolution equations.

d. Implications for DIS phenomenology at HERA.

2. Single particle production in high energy QCD.

a. Classical particle production.

b. Particle production in the nonlinear evolution.

c. Hadron production phenomenology in pA collisionsat RHIC and, in the near future, LHC.

d. Hadron multiplicity in AA collisions at RHIC andLHC.

3. Particle correlations in high energy QCD.

a. Classical correlations.

b. Nonlinear evolution effects.

c. Correlations in pA collisions at RHIC.

d. Connections to spin physics.

The indicated introductory references containing reviewson the subject are in the following:[1] ”Saturation physics and deuteron-Gold collisionsat RHIC”, Jamal Jalilian-Marian, Yuri V. Kovchegov,Prog.Part.Nucl.Phys. 56 (2006) 104-231, e-Print: hep-ph/0505052.[2] ”High Energy QCD”, Yu.V. Kovchegov, E. Levin, Cam-bridge University Press, to be published August 2012.

Lectures (10h30 - 12h30)

Lecture: Lipari I

[23/04/12 - 10h30 - Local: Salao Chardonnay]Cosmic Rays and Hadronic Physics, Paolo Lipari,

INFN and Dipartimento di Fisica University of Roma, Italy�These lectures want to give an introduction to the presentstatus of Astroparticle Physics, giving special emphasis to adiscussion of the importance of the description of hadronicinteractions in the interpretation of the observations of cos-mic rays at the highest energy. Over recent years there hasbeen marked growth in interest in the study of techniques

of cosmic ray physics by astrophysicists and particle physi-cists. Cosmic radiation is important for the astrophysicistbecause in the farther reaches of the universe. For particlephysicists, it provides the opportunity to study neutrinosand very high energy particles of galactic origin. More im-portantly, cosmic rays constitue the background, and insome cases possibly the signal, for the more exotic uncon-firmed hypothesized particles such as monopoles and spar-ticles. Focusing on the highest energy cosmic rays, theselectures describe where they originate, acquire energy, andinteract, in accreting neutron stars, supernova remnants,in large-scale shock waves. It is reviewed also their inte-ractions in the atmosphere and in the earth, how they arestudied in surface and very large underground detectors,and what they tell us. The lectures will include a summaryof recent results in cosmic rays, gamma astronomy and neu-trino astronomy, and a brief discussion of the study of thenature of Dark Matter from observations of cosmic ray flu-xes. The study of the cosmic rays at the highest energiesrequires the modeling of hadronic interactions up to a c.m.energy of 400 TeV. Measurements at LHC can help in theextrapolation to these energies.

Lecture: Typel I

[23/04/12 - 11h30 - Local: Salao Chardonnay]Clusters in Nuclear Matter and the Equa-tion of State for Astrophysical Applications,Stephan Typel, GSI Helmholtzzentrum fur Schwerio-nenforschung, Germany �The equation of state (EoS) ofnuclear matter is an essential ingredient in the descriptionof astrophysical phenomena like neutron stars and core-collapse supernovae. What is the purpose of studying thenuclear matter phase diagram? The answer is that weneed this information to understand the early history ofour universe, and to understand high-density objects, cal-led ”neutron stars”in our present-day universe. It has tobe known in a wide range of densities, temperatures andneutron-to-proton asymmetries. Constraints for the EoScan be obtained from a variety of fields: properties of nu-clei, nucleon-nucleon scattering, heavy-ion collisions and as-tronomical observations. The thermodynamical propertiesof matter are strongly affected by correlations, in particu-lar the appearance of inhomogeneities and the formation ofclusters that also modify the chemical composition of thesystem. Vice versa, the properties of nuclei, e.g. their bin-ding energies, change in a dense medium. In the lectures,these features will be discussed in the context of an exten-ded relativistic density functional approach in comparisonto other models. In summary, the study of the nuclearequation of state is connected to the initial phases of theearly Universe, to ultra-violent stellar explosions, and toexperiments at laboratories around the world. These la-boratories bring nuclei, which are traveling almost at thespeed of light, into violent collisions to perhaps produce astate of matter in which quarks and gluons, if only briefly,become free particles.

16 23/04/12 - XII HADRON PHYSICS

Talks (15h - 17h)

Talks - Session 01

[23/04/12 - 15h00 - Local: Salao Chardonnay]Momentum space dipole amplitude for DIS and in-clusive hadron production, M.B. Gay Ducati, Insti-tuto de Fisica - UFRGS �We show how the AGBS model,originally developed for deep inelastic scattering applied toHERA data on the proton structure function, can also des-cribe the RHIC data on single inclusive hadron yield ford + Au and p + p collisions through a new simultaneousfit. The single inclusive hadron production is modeled th-rough the color glass condensate, which uses the quark(andgluon)–condensate amplitudes in momentum space. TheColor Glass Condensate (CGC) is the description of theproperties of saturated gluons in the infinite momentumframe in the Regge-Gribov limit. The effective degreesof freedom in this framework are color sources at largeBjorken-x variable and gauge fields at small-x. At highenergies, because of time dilation, the former are frozen co-lor configurations on the natural time scales of the stronginteractions and are distributed randomly from event toevent. The latter are dynamical fields coupled to the staticcolor sources. The AGBS model is also a momentum spacemodel based on the asymptotic solutions of the BK equa-tion, although a different definition of the Fourier transformis used. This description entirely in transverse momentumof both processes arises for the first time. The small diffe-rence between the simultaneous fit and the one for HERAdata alone suggests that the AGBS model describes verywell both kind of processes and thus emerges as a goodtool to investigate the inclusive hadron production data.We use this model for predictions at LHC energies, whichagree quite well with available experimental data

[23/04/12 - 15h30 - Local: Salao Chardonnay]Multi-particle production in the CGC framework,Cyrille Marquet, CERN - Theory Division, Switzer-land �Within the Color Glass Condensate (CGC) fra-mework, I will discuss particle production in the collisionof a dilute projectile with a dense hadronic target. Foryears CGC studies focused on the dipole scattering ampli-tude, and its evolution towards high energies or small x.One has now reached an accuracy sufficient to quantitati-vely describe single inclusive particle production in p+Atype collisions, at least in the forward rapidity region, sen-sitive to the smallest values of x. Recently the focus hasturned to the quadrupole amplitude, necessary to computethe two-particle inclusive case. Actually in the large-Nclimit, only dipoles and quadrupoles contribute, and I willshow that this is the case irrespectively of the numbersof particles measured in the final state. Within the ColorGlass Condensate (CGC) framework, I will discuss parti-cle production in the collision of a dilute projectile with adense hadronic target. For years CGC studies focused onthe dipole scattering amplitude, and it’s evolution towardshigh energies or small x. One has now reached an accuracysufficient to quantitatively describe single inclusive particleproduction in p+A type collisions, at least in the forwardrapidity region, sensitive to the smallest values of x. Re-

cently the focus has turned to the quadrupole amplitude,necessary to compute the two-particle inclusive case. Ac-tually in the large-Nc limit, only dipoles and quadrupolescontribute, and I will show that this is the case irrespecti-vely of the numbers of particles measured in the final state.

[23/04/12 - 16h00 - Local: Salao Chardonnay]DVCS at an eRHIC: towards a high resolution par-tonic imaging, Salvatore Fazio, Brookhaven NationalLaboratory, USA �The feasibility for a measurement of theexclusive production of a real photon, a process althoughknown as Deeply Virtual Compton Scattering (DVCS) atan eRHIC has been explored. An electron-proton/ion colli-der facility (eRHIC) is under consideration at BrookhavenNational Laboratory (BNL). Such a new facility will requirethe design and construction of a new optimized detectorprofiting from the experience gained from electron-protoncolliders like at the experiments H1 and ZEUS at DESY-HERA. In particular, eRHIC is a machine designed to col-lide an electron beam with energies ranging from 5 GeVup to 30 GeV with the RHIC hadron beams (protons (100-250 GeV) and nuclei (≤ 100 GeV)) at varying center-of-mass energies. DVCS is universally believed to be a goldenmeasurement toward the determination of the GeneralizedParton Distribution (GPDs) functions. The high lumino-sity of the machine, expected in the order of 1034cm−2s−1

at the highest center-of-mass energy, together with the largerapidity acceptance of a newly designed dedicated detector,will open the opportunity for very high precision measure-ments of DVCS, providing an important tool toward a 2+1dimensional picture of the internal structure of the proton.The huge impact such measurements would have on thedetermination of GPDs will be discussed.

[23/04/12 - 16h30 - Local: Salao Chardonnay]Exclusive electroproduction of vector mesons: fromhigh to low energy, Laurent Favart, Universite Li-bre de Bruxelles, Belgium �The exclusive electroproduc-tion of mesons on the nucleon is an important tool to bet-ter understand the nucleon structure and, more generally,the transition between the low energy hadronic and highenergy partonic domains of the Quantum Chromodynamics(QCD) theory. In particular, the exclusive electroproduc-tion of light vector mesons is a good process for studyingthe transition from the soft to the hard regime of stronginteractions, the former being well described within theRegge phenomenology while the latter - by perturbativeQCD (pQCD). When calculating the cross section of ex-clusive electroproduction of vector mesons, one needs infor-mation on the wave function of the initial virtual photon,the wave function of the produced vector meson, the qqpscattering amplitude, which requires the gluon density andthe proton elastic form factor meson electroproduction interms of a two-gluon exchange. The available data can bethen used to discuss what one can learn about the producedvector meson wave function and about the gluon density inthe proton. On other hand, there are recent experimentalresults from the CLAS collaboration at low energy regimeand the interpretation is based on the framework of genera-lized parton distribution functions. In this presentation theworldwide results are briefly reviewed on exclusive vectormeson production in photo and electro-productions. Gene-


ral behaviour of the cross section and of the Spin DensityMatrix Elements as a function of the main kinematic vari-ables are discussed and compared for high (H1, ZEUS) andlow (HERMES, CLAS) energy measurements. Comparisonto different theoretical expectations are also discussed.

Posters (17h - 17h30)

Posters - Session A

[23/04/12 - P001]Heavy quark production in photon-Pomeron inte-ractions at high energies, Victor Paulo Barros

Goncalves, , Mairon Melo Machado, IFM - UFPel- Brazil �The diffractive processes are attracting muchattention as a way of amplifying the physics programmeat proton colliders, including searching for New Physics.The investigation of these reactions at high energies gi-ves important information on the structure of hadrons andtheir interaction mechanisms. Hard diffractive processes al-low the study of the interplay of small- and large-distancedynamics within QCD. For heavy quark hadroproduction,single-diffractive dissociation can occur characterized bythe existence of one large rapidity gap, which can be re-presented by the Pomeron exchange. In this work, thediffractive heavy quark cross sections are estimated con-sidering photon-Pomeron interactions in hadron - hadronat RHIC, Tevatron, and CERN LHC energies. We assumethe validity of the hard diffractive factorization and calcu-late the charm and bottom total cross sections and rapiditydistributions using the diffractive parton distribution func-tions of the Pomeron obtained by the H1 Collaborationat DESY-HERA. Such processes are sensitive to the gluoncontent of the Pomeron at high energies and are a goodplace to constrain the behavior of this distribution. Moreo-ver, we compare our predictions with those obtained usingthe dipole model. We verify that this process is a goodtest of the different mechanisms for heavy quarks diffrac-tive production at hadron colliders.

[23/04/12 - P002]Exclusive processes in electron-ion collisions in thedipole formalism., Erike Cazaroto, Fernando Na-

varra, USP - SP - Brazil, Fabiana Carvalho, UNI-FESP - SP - Brazil, Maria Kugeratski, UFSC - SC -Brazil, Victor Goncalves, UFPel - RS - Brazil �Wecalculate the cross sections of exclusive final states inelectron-ion collisions. We consider four different final sta-tes. Three of them containing vector mesons, namely themesons ρ, φ and J/Ψ and the fourth one containing a realphoton γ. The electron-ion collision containing a real pho-ton in the final state is called Deep Virtual Compton Scat-tering (DVCS). In the electron-ion collision the electronemits a virtual photon which in turn interacts with the tar-get nucleus. In our calculations we use the dipole forma-lism, which implies that before interacting with the targetnucleus the virtual photon opens in a qq pair. The pair iscalled “color dipole” and it interacts with the nucleus bythe strong force. The advantage of using the dipole for-malism is that it allows to include saturation effects in thegluons distribution of the target naturally. We consider

two different saturation models in our calculations. Thesemodels describe the dipole-nucleon cross section. In orderto describe the dipole-nucleus cross section we generalizethe dipole-nucleon one by using the Glauber-Mueller for-malism. Besides considering four exclusive final states weconsider also the coherent and incoherent reactions. Thecoherent reaction is that one in which the nucleus A, pre-sent in the initial state of the process, remains unaffectedand is present in the final state too. In the incoherent reac-tion the nucleus A is not present in the final state. Instead,we have other hadron A∗.

[23/04/12 - P003]Hadronic thermal model with two freeze-out tem-peratures, S.B. Duarte, , L.P.G. de Assis, CBPF- RJ - Brazil, M. Chiapparini, UERJ - RJ - Brazil, L.

Hirsch, UTFPR - PR - Brazil, A. Delfino, UFF - RJ- Brazil �A significant amount of experimental data forparticle production in high energy heavy ion collisions (10- 200 GeV/A at center of mass) has been accumulated du-ring the last years. Many different theoretical attemptshave tried to described these data using thermal modelsin the approximation of global thermal equilibrium con-sidering only one freeze-out temperature. Because of itssimplicity, the model is well acceptable in order to treatand explain the data. However the thermal models oftenare not able to describe adequately all multiplicities of ha-drons, for instance, the abundance of strange particles areoverestimate and the pion yields are underestimated. Inthis work we presented a thermal hadronic model with twodifferent temperatures describing the freeze out of the ex-panding fireball in a ultra-relativistic heavy ion collision ispresented. We introduced different effective freeze out tem-peratures for the baryonic and mesonic sectors. The modelis applied to fit the particle population ratios of hadronsproduced in the reaction. The proposal is not merely toincorporate one additional degree of freedom to the adjust-ment procedure of data within the thermal model, but tostress out a different scenario for the freeze out stage in thecollisional process. The reformulated version of the ther-mal model was applied to a set of consolidated data foundin the literature, offering a rather good improvement in thefitting quality of calculated particle ratios to the data.

[23/04/12 - P004]Medium effects and jet fragmentation at the LHC,Sony Martins, Cristiano Brenner Mariotto, Luiz

Fernando Mackedanz, FURG - RS - Brazil �Jet quen-ching is one of the important phenomena to study the pro-perties of the quark gluon plasma, which is believed to beproduced in relativistic heavy ion collisions. Jet energyloss in the quark gluon plasma is the main explanation forjet quenching, which may suppress the number of hadronsproduced while the jets traverse the dense and colorfull me-dium created. Additionally, the shadowing of the partondistributions, a tipically initial state effect, alter that yield,with suppression or enhancement depending on the kinema-tic region probed. In the LHC, the energy loss may haveboth radiative and collisional components. This energy lossaffects both the pT spectra and the kinematic region for jetfragmentation. In this work we study the production ofcharged and neutral hadrons in ultrarelativistic heavy ion


collisions. We quantify the medium effects by calculatingthe nuclear ratio RAA as a function of the transverse mo-mentum of the produced hadron. The main ingredients arethe shadowing of the nuclear parton distributions, the jetenergy loss and the fragmentation functions modified bythe hot and dense medium. Our results are focused on theinterplay of the different effects, and the final results arecompared with RHIC and LHC data.

[23/04/12 - P005]Nuclear effects in squark production atthe LHC, Cristiano Brenner Mariotto, ,

Marcos Cardoso Rodriguez, Universidade Fede-ral do Rio Grande (FURG), Danusa Bueno Espindola,

Universidade Federal de Santa Catarina (UFSC) �Oneof the main goals of the LHC experiment is to confirm theStardard Model and to find the physics beyond it, wheresupersymmetric particles are the most popular candidates.The main motivation to study Supersymmetric modelsis that they can stabilize the hierarchy MW � MH ifthe supersymmetric partners of known particles havemasses no larger than a few TEV. Another nice aspectin Supersymmetric theories is that if R-parity is holdwe have nice candidates to Dark Matter, which couldbe the lighest neutralino, sneutrino or gravitino. In thiscontribution we study the production of squarks, the spinzero superpartners of the quarks. In any theory withmany scalar fields, there are potentially new sources offlavor-changing currents. In the squark sector we have ingeneral case a 6 × 6 mass matrix for the u-type squarkfields and for the d-type squarks fields. For example a largeoff-diagonal entry in the mass matrix would result in alarge flavor-violating gluino vertices, and an unacceptablerate to b → sγ decays via diagrams involving squarkand gluino loops. The main solution to this problem isknown as decoupling where we get three unrelated massmatrix 2 × 2 to each squark flavor. If squarks are foundin proton-proton (pp) collisions at the LHC, they mightalso be produced in collisions involving nuclei (pA and AAcollisions). Here we investigate the influence of nucleareffects in the production of squarks in nuclear collisionsat the LHC, and estimate the transverse momentum

dependence of the nuclear ratios RpA = dσ(pA)dpT

/Adσ(pp)dpT

and RAA = dσ(AA)dpT

/A2 dσ(pp)dpT

. We demonstrate that

depending on the magnitude of the nuclear effects, theproduction of squarks could be enhanced or suppressed,compared to proton-proton collisions at same energies.The study of these observables can be useful to determinethe magnitude of the shadowing and antishadowing effectsin the nuclear gluon distribution. Moreover, we testdifferent SPS scenarios, corresponding to different softSUSY breaking mechanisms, and find that the nuclearratios are strongly dependent on that choice.

[23/04/12 - P006]Thermal Dileptons as a Baseline for Thermal Quar-konia for LHC, Fabio Kopp Nobrega, Luiz Fer-

nando Mackedanz, Universidade Federal do Rio Grande- FURG �In Relativistic Heavy Ion Collisions is expectedto be formed a deconfined state of hadronic matter - the socalled Quark Gluon Plasma (QGP), a transient state where

quarks and gluons are supposed to exhibit a collective beha-vior. Due to its transient state, it only be detected indi-rectly for probes. Photons e dileptons are considered thecleanest signals of QGP, because of the very nature of theirinteraction, they decouple immediately and leave the sys-tem without any distortion of their energy-momentum car-rying with them the information from within the reactionzone. Since their production cross sections are strongly de-pendent on temperature, they are copiously produced fromthe hot phase of the system evolution. These dileptons arecalled thermal dilepton. The most dominant contributionits production from a quark gluon plasma (QGP) in rela-tivistic high-energy heavy ion collisions comes from quarkanti-quark annihilation, for quarkonia production, however,the gluon fusion process is claimed to be dominant. Wecalculate the thermal emission rates for dileptons and forquarkonia at LHC energies, showing that dileptons remainsa good baseline to study phenomena associated to quarko-nia production. Even in a medium where the productionrates are equivalent to the suppression rates, we show, inthis communication the importance of the dilepton analysisto the high energy particle physics.

[23/04/12 - P007]Cold matter effects and quarkonium productionat RHIC and LHC, Glauber Sampaio dos Santos,

Cristiano Brenner Mariotto, Universidade Federaldo Rio Grande (FURG) - RS - Brazil, Victor Paulo

Barros Goncalves, Universidade Federal de Pelotas(UFPEL) - RS - Brazil �Quarkonium suppression is one ofthe signals of formation of the so called quark gluon plasma(QGP) in ultrarelativistic heavy ion collisions. However,the presence of cold matter effects, which do not involvethe creation of the QGP, make the analysis more diffi-cult. In order to disentangle the hot and cold mattereffects, one may look first into pA collisions, where onlycold matter effects play a role, and then apply these ef-fects to AA collisions. Additionally, the quarkonium pro-duction mechanism itself is still not a resolved issue. Inthis contribution we study J/ψ and Υ production in nu-clear collisions at RHIC and LHC. We consider two maincold matter effects, namely the shadowing effect, an ini-tial state effect which modifies the parton densities in nu-clei relative to the nucleon, and the nuclear absorption,a final state effect related with the propagation and at-tenuation of the quarkonium state when moving throughthe nuclear medium. Since the quarkonium hadroproduc-tion is strongly dependent on the nuclear gluon distribu-tion, these processes are useful to constrain the magnitudeof the shadowing and antishadowing effects in the nuclearparton densities. We study the interplay of these effectsby estimating the rapidity dependence of the nuclear ra-tios RpA = σpA(J = J/ψ,Υ) = Aσpp(J = J/ψ,Υ) andRAA = σAA(J = J/ψ,Υ) = A2σpp(J = J/ψ,Υ) at RHICand LHC energies. The results indicate that nuclear sha-dowing alone is not able to explain the available data.

[23/04/12 - P008]Electron-Hadron correlations in p+p collisionsat

√s = 2.76 TeV in the ALICE experiment,

Elienos Pereira de Oliveira Filho, (for the ALICECollaboration)


Nuclear Physics Department, Universidade de Sao PauloSao Paulo, Brazil �One of the aims of High Energy Col-liders is the study of the Quark Gluon Plasma (QGP), astate of matter which can be created after collisions betweenheavy ions at high energies. One important way to investi-gate this matter is looking into heavy quarks. Due to theirlarge mass, heavy quarks are produced at very early stagesof the medium expansion and because of this, one can getimportant information of the partonic phase of the systemevolution. Because of their large mass, cross section can becalculated by perturbative theories.There are many different ways to experimentaly study he-

avy quarks. One of them corresponds to the observationof semi leptonic decays of mesons containing those quarks.In this case, however, one must find methods to distinguishdecays of mesons containing charm and bottom quarks.In this work we are studying the relative bottom to charmproduction in p+p collisions, through correlations betweenelectrons from heavy flavour mesons and charged hadrons,with ALICE (A Large Ion Collider Experiment) detector,one of the LHC (Large Hadron Collider) experiments. Thisis an important baseline for the analysis in the most com-plex scenario of Pb+Pb collisions.

ALICE Collaboration, ALICE: PPR Vol. 1, J. Phys. G: Nucl.Part. Phys. 30 (2004) 1517 - 1763. ALICE Collaboration,ALICE: PPR Vol. 2, J. Phys. G: Nucl. Part. Phys. 32 (2006)1295 - 2040.

[23/04/12 - P009]J/Ψ Measurements in 7 TeV p-p collisi-ons at ALICE using EMCal-triggered events,Marcel Araujo Silva Figueredo,

for the ALICE Collaboration, Universidade de SaoPaulo �J/Ψ measurements can be performed in theALICE experiment [1] through the dilepton decay intoe−e+ (for rapidity |y| < 0.9) and μ−μ+ (for rapidity−4.0 < y < −2.5) pairs, in proton-proton, proton-nucleusand nucleus-nucleus collisions. Proton-proton collisionsare specially important for the ALICE physics program,since they provide baseline results to be compared withPb-Pb, where one expects the production of the Quark

Gluon P lasma (QGP ) [2]. Moreover, these measure-ments are interesting per se because the mechanism ofcharmonium production in hadron interactions is not yetfully understood. The ALICE Eletromagnetic Calorimeter(EMCal) [3] extends the pT range of J/Ψ measurements,since it provides electron/hadron discrimination for higherpT values in comparison to other electron PID techniquesin ALICE. The EMCal can also provide fast triggers forevents containing high energy electrons. In 2011, duringproton-proton collisions at 7 TeV, the ALICE EMCal trig-ger was intensively used for event selection of high energyshowers above 4.8 GeV. In this poster, some results from2011 proton-proton collisions will be presented, showing avery good measurement of J/Ψ, due to a combination ofthe ALICE EMCal PID and trigger system.

[1] ALICE: Physics Performance Report, Volume I, J. Phys. G:Nucl. Part. Phys. 30 (2004) 15171763;

[2] T. D. Lee, Nucl. Phys. A590 (1995) 11c;[3] ALICE Eletromagnetic Calorimeter - Technical Proposal-,

CERN/LHCC 96-32-Add3, (2006);

[23/04/12 - P010]Polarization effects at RHIC and LHC,Celso de Camargo Barros jr., Universidade Federalde Santa Catarina �Recently, the STAR collaborationhas measured the Λ and Λ polarizations as functions of thetransverse momentum and the pseudorapidity in 200 GeVAu-Au collisions [1] at RHIC. In this study, the globalpolarization has been measured, and the results presentssome differences when compared with the ones obtained inproton-nucleus collisions. These results can be understoodin terms of a model [2], that we proposed recently, basedon the hydrodynamical model, and taking into accountthe average effect of the final-state interactions (thatoccur in the hadronic phase) between the hyperons andother produced particles. The final interactions are takeninto account considering chiral effective lagrangians formesons, hyperons and resonances, that interact by manyhadronic processes. This model has been used peviuoslyto study the antihyperon polarization data obtained in

proton-nucleus collisions and describe the experimentaldata quite well. Now we extended this model to studynucleus-nucleus collisions at RHIC systems, with a verygood accord. Theoretical results obtained with othermodels will also be discussed.The perspectives of hyperon polarization at LHC is anothersubject of interest and it is straightforward to extend theproposed model in order to study these collisions.

[1] STAR Collaboration: B. I. Abelev et al., Phys. Rev. C ,76, (2007) 024915.[2] C. C. Barros Jr. and Y. Hama, Phys. Lett. B., 699, 74(2011).

[23/04/12 - P011]Producao de duplo boson Z como teste de di-mensoes extras, Werner Sauter, Victor P. B.

Goncalves, UFPel �Neste trabalho, exploramos a pos-sibilidade de medicao de efeitos multi-dimensionais em umtipo especıfico de colisao em altas energias, a saber, aproducao exclusiva central de pares de bosons Z em colisoesde ıons pesados. A fascinante possibilidade de dimensoesextras vem desde as ideias de Kalusta e Klein e tem sidoconsiderada como uma possıvel explicacao para o fenomenoda hierarquia de escalas no modelo padrao e uma fonte de


nova fısica a ser explorada no LHC. Dimensoes extras naosao observadas devido a sua compactificacao em escalas taisque possıveis efeitos somente seriam observados com ener-gias da ordem da energia de Planck.Entretanto, ha mecanismos propostos em que estas di-mensoes extras pudessem ser testadas em uma escala deenergia ja disponıvel no LHC. Dentre os mecanismos en-contrados na literatura, destacamos os cenarios ADD e oRS.No cenario ADD, os campos do modelo padrao estao confi-nados em uma variedade quadrimensional embebida em umespaco maior. As escalas das dimensoes extras emcontram-se, por argumentos astronomicos e experimentais, na ordemdos femtometros, ao invez de escalas muito menores predi-tas, por exemplo, pela teoria de cordas. A geometria dasdimensoes extras e compactificacao na forma de um toro.Somente os estados de graviton podem proparar pelo todoespaco, explicando por que a gravitacao tem uma escalarelativa muito menor que as outras interacoes. O modelotambem prediz uma reducao drastica na escala de Planck,o que leva a consequencias na producao de gravitons e bu-racos negros em colisores, podendo ser produzidos copiosa-mente. Os estados de graviton formam uma torre de esta-dos do tipo Kalusta-Klein com excitacoes muito proximas.O cenario RS e caracterizado por um espaco pentadimen-sional com geometria do tipo anti- De Sitter com a quintadimensoes sendo vergada ou empenada. A quinta dimensaoliga duas branas, uma em que ”mora”os campos do mo-delo padrao e outra brana. Os gravitons, pela geometriatem probabilidade maior de estar mais proximos da ou-tra brana do que da do modelo padrao, o que explica apequena intensidade da gravitacao neste modelo. Uma ca-racteristica deste cenario sao as massas bem definidas paraas exitacoes da torre de Kalusta-Klein para os gravitons.A estabilizacao do raio de compactificacao acaba por intro-duzir uma partıcula escalar extra no modelo, o radion. Aproducao de radion ja foi foco de um trabalho anterior dosAutores.Os motivos para a analise deste processo em particular sao:o diagrama para a fusao de dois gluons em dois bosons decalibre com a troca de um graviton esta ao nıvel de arvore,quanto que no modelo-padrao ele tem um loop. Assim, comtroca de graviton e dominante; o mecanismo de producaocentral fornece um esquema claro de deteccao no colisor,muito embora as secoes de choque sejam baixas e padessamcom o fenomeno de pile-up.Estudamos a producao de dublo Z em colisoes proton-proton a 7 TeV e 14 TeV, em colisoes proton-chumbo a 8.8TeV e chumbo-chumbo a 5.5 TeV, bem como para ener-gias de raios cosmicos. Os resultados dependem da escalade massa utilizada favorecendo valores da ordem de pou-cos TeV e do numero de dimensoes e da mesma forma, umnumero maior de dimensaoes extras. Devido ao aumentona distribuicao de gluons em projeteis nucleares, a taxade producao e maior para colisoes Pb-Pb do que proton-proton. Os nossos resultados apresentam uma secao dechoque, que junto com a luminosidade do LHC permite aobservacao de um numero apreciavel de eventos por ano.

[23/04/12 - P012]Three-body model for the final state interac-

tion in heavy meson decay, T. Frederico, ,

K.S.F.F. Guimaraes, W. de Paula, O. L. S. Filho,

Instituto Tecnologico de Aeronautica, I. Bediaga, A. C.

dos Reis, Centro Brasileiro de Pesquisas Fısicas, P. C.

Magalhaes, M. Robillota, Instituto de Fısica, Univer-sidade de Sao Paulo �A challenge in mesonic three-bodydecays of heavy mesons is to quantify the contribution of re-scattering between the final mesons. D decays have the uni-que feature that make them a key to light meson spectros-copy, in particular to access the Kπ S-wave phase-shifts.We built a relativistic three-body model for the final stateinteraction in D+ → K−π+π+ decay based on the ladderapproximation of the Bethe-Salpeter equation projected onthe light-front. The decay amplitude is separated in a smo-oth term, given by the direct partonic decay amplitude, anda three-body fully interacting contribution, that is factori-zed in the standard two-meson resonant amplitude timesa reduced complex amplitude that carries the effect of thethree-body rescattering mechanism. The off-shell reducedamplitude is a solution of an inhomogeneous Faddeev typethree-dimensional integral equation, that includes only isos-pin 1/2 K−π+ interaction in the S-wave channel. The elas-tic K−π+ scattering amplitude is parameterized accordingto the LASS data. The integral equation is solved numeri-cally and preliminary results are presented and comparedto the experimental data from the E791 Collaboration andFOCUS. Besides that we show the firsts steps in analysisof the same decay at LHCb.At this moment we show theuse of fastmc and the different types of fitting used on themethod, such as binned, unbinned fit and polynomial fit.

[23/04/12 - P013]Obtaining the strong coupling constant gJ/ψDsDs

from QCD Sum Rules., B. Osorio Rodrigues, M.

Chiapparini, M. E. Bracco, UERJ - RJ - Brazil �Theform factors and the coupling constants of the vertexJ/ψDsDs were calculated in this work by the use of theQCD Sum Rules (QCDSR).This vertex is involved in some of the numerous hypothe-ses for the constitution of exotic mesons. For example,this vertex appears in the decay Y (4140) → J/ψφ whenit is studied with an intermediate decay as Y (4140) →DsD

(∗)s → J/ψφ. Another analogous example is the decay

X(4350) → D(∗)s D

(∗)s → J/ψφ, where the vertex J/ψDsDs

is also present.So we hope that the more precise knowledge of this couplingconstant and form factors may improve the understandingof the fundamental constitution of these new observed me-sons.In this work, we have considered the cases where Ds andJ/ψ mesons are off-shell, obtaining two different form fac-

tors: g(J/ψ)J/ψDsDs

(Q2) = 3.21e−Q2/13.70 and g

(Ds)J/ψDsDs

(Q2) =

2.50e−Q2/4.42. They are both exponential, but we noted

the same behavior of previous works of the group: the formfactor is harder when the heavier meson (J/ψ) is off-shell.We also obtained the coupling constant for this vertex,gJ/ψDsDs

= 6.34+1.09−0.98, which is in agreement with previ-

ous QCDSR results obtained by the group for the vertexesgJ/ψDD and gJ/ψD∗D∗ when using the necessary symmetryconsiderations.


[23/04/12 - P014]Hadron production at LHC in dipole momentumspace, Eduardo Basso, Maria Beatriz Gay, IF -UFRGS - RS - Brazil, Emmanuel de Oliveira, IF -USP - SP - Brazil �The dipole color approach is the fra-mework that considers the quark-antiquark pair scatteringoff the target. The rapidity evolution of color dipoles isgiven by the nonlinear Balitsky-Kovchegov (BK) equation,for which analytical solutions are not yet known. A goodway to explore the asymptotic BK solutions is through thetraveling wave method of QCD, that uses a correspondencebetween the BK evolution equation in momentum spaceand the Fisher-Kolmogorov-Petrovsky-Piscounov (FKPP)reaction-diffusion equation that admits the traveling wavestrains as solutions. In the QCD variables such wave trainsare tantamount to the geometrical scaling property of thehigh energy QCD amplitudes. This theoretical approachwas confronted to the HERA data through the travelingwave based AGBS model of the dipole amplitude in mo-mentum space. Moreover, the model has shown being ingood agreement with the hadronic collision data, with theparameters constrained to both the deep inelastic scatte-ring HERA data on the proton structure function and theRHIC data on single inclusive hadron yield for d−Au andp− p collisions at forward rapidities. Using the AGBS mo-del and within the kt-factorization formalism, we describethe LHC data on the single inclusive hadron productionfor p− p collisions. Predictions for the forthcoming p − Acollisions are also shown.

[23/04/12 - P015]Non-linear QCD dynamics in two-photon interac-tions at high energies, Fabiana Carvalho, Fer-

nando Navarra, Victor P.B. Goncalves, Eric Ca-

zaroto, Universidade Federal de Sao Paulo - UNIFESP�Perturbative QCD predicts that the growth of the gluondensity at high energies should saturate, forming a ColorGlass Condensate (CGC), which is described in mean fieldapproximation by the Balitsky-Kovchegov (BK) equation.In this paper we study the γγ interactions at high energiesand estimate the main observables which will be probed atfuture linear colliders using the color dipole picture. Wediscuss in detail the dipole - dipole cross section and pro-pose a new relation between this quantity and the dipolescattering amplitude. The total γγ, γ∗γ∗ cross-sections andthe real photon structure function F γ2 (x,Q

2) are calculatedusing the recent solution of the BK equation with runningcoupling constant (presented in J. L. Albacete, N. Armesto,J. G. Milhano and C. A. Salgado, arXiv 0902 1112 [hep-ph])and the predictions are compared with those obtained usingphenomenological models for the dipole-dipole cross sectionand scattering amplitude (for instance, the GBW model).We demonstrate that these models are able to describe theLEP data at high energies, but they predict a very differentbehavior for the observables at higher energies. Thereforewe conclude that the study of γγ interactions can be usefulto constrain the QCD dynamics.

[23/04/12 - P016]Hadronic Cross Sections, Elastic Slope and Physi-cal Bounds, D.A. Fagundes, M.J. Menon, Institutode Fısica Gleb Wataghin, Universidade Estadual de Cam-

pinas - UNICAMP, 13083-859 Campinas, SP, Brazil �Incosmic-ray physics, extensive air showers (EAS) constitutean important tool in the investigation of particle and nu-clear physics at energies far beyond those obtained in acce-lerator machines. However, the physical interpretation ofthe EAS depends on extrapolations from phenomenologicalmodels that have been tested only in the accelerator energyregion, resulting therefore in systematic theoretical uncer-tainties. One of model-dependent quantities that demandsextrapolation involves the total cross section, σtot and theforward slope of the elastic differential cross section, Bel. Inthis communication, an analytical parametrization for theratio of the total cross section to the forward elastic slopeis discussed. The approximate relation between this ratioand that of the elastic to total cross section, R, is derivedand explored together with the experimental data availa-ble. Through fits to the R data for proton-proton scatteringabove 10 GeV the energy dependency of the ratio σtot/Belis inferred in an almost model-independent way. In thesefits we have considered the recent data published by theTOTEM Collaboration at 7 TeV for the ratio R and twopossible scenarios for asymptotia: either (i) the black disklimit is attained, σel/σtot → 1/2, or (ii) the obvious unita-rity bound is satured at s → ∞, σel/σtot → 1. The latter,corresponding to the U-Matrix unitarization scheme, comesup as a plausible physical scenario for asymptotia allowedby the existing accelerator data. All results are consistentwith the MacDowell-Martin lower bound for purely imagi-nary scattering amplitudes. As a model-independent resultin the context of hadronic physics, this parametrization canbe useful in cosmic ray studies of astrophysical phenomenaand in the extraction of proton-proton cross sections fromproton-air cross sections obtained at the highest energies.

[23/04/12 - P017]Hadronic Differential Cross Section Data and theTsallis Distribution, D.A. Fagundes, , M.J. Menon,

P.V.R.G. Silva, Instituto de Fısica Gleb Wataghin, Uni-versidade Estadual de Campinas - UNICAMP, 13083-859Campinas, SP, Brazil �The differential cross section cons-titutes one of the most important quantity in the investiga-tion of the high-energy elastic hadron scattering. In termsof the momentum transfer the experimental data are cha-racterized by the diffractive pattern, involving the diffrac-tive peak, the dip-bump structure and a monotonic decre-ase at large momentum transfer. Experimental informationavailable on proton-proton scattering at 19 - 60 GeV com-prises ten decades of experimental data, which turns outvery difficult any empirical or phenomenological treatment.On the other hand, the Tsallis distribution has been widelyused in the description of the transverse momentum spec-tra of identified particles. A striking feature is the fact thatthese spectra have similar shapes as those characteristic ofthe elastic differential cross sections beyond the dip posi-tion. Based on this similarity, we have developed an empi-rical analysis of the proton-proton differential cross sectiondata with a parametrization based on the Tsallis distri-bution for the intermediate and high momentum transferregion, together with two exponential functions for the lowmomentum region. With only nine free parameters we ob-tain good descriptions of all the available data in the energy


region 19.4 - 62.5 GeV. These results suggest that a ther-modynamical interpretation of the deep elastic scatteringregion may be possible. However, we limit this communi-cation only on empirical aspects of our analysis.

[23/04/12 - P018]The effective mass of the pions in a hot mesonsmatter., F.J. de Almeida Gama, , C.A.A. Izidorio,

R. Rodrigues da Silva, Universidade Federal de Cam-pina Grande, E. Cunha, Universidade Federal de Alagoas�The system composite by a great number of pions is abun-dately produced in heavy ion colisions and this kind of mat-ter is usually treated by ideal pion gas, on the other hand, in1990, Shuryak predicted that the many body system com-posite by pions, called pion matter, in high temperatureinterval TC =100-200 MeV is rather a ”liquid”. Kostyukusing quiral perturbation theory found a more precise re-sult for phase transition gas-liquid and they get TC = 136MeV. More recently, Anchishkin and Nazarenko used meanfield theory, they predicted an other value, TC = 43 MeV,and the liquid signature is related to the abruptlly drop ofeffective mass as a function of temperature.In this work, we apply the mean field theory to study theπ+ − π− matter. The hot and dense matter composed ofequal number of π+ and π− is studied in a linear sigmamodel using relativistic mean field theory. We get the pionand sigma effective mass grow slowly as increasing tempera-ture, but at the temperatures T > 100 MeV, there are highincreasing of pion effective mass as an increasing tempera-ture. We conclude that this matter has a dense phase withhigh pressure, energy density and energy per pair. This re-sult are in agreement with Shuryak’s predictions that pionmatter at high temperature is rather a ”liquid”.

[23/04/12 - P019]High Density Effects in the DileptonProduction in Cosmic Ray Interactions,Rosalia Kruger de Castro, Victor Paulo

Goncalves, UFPel - RS - Brazil, Marcos Andre

Betemps, IFSul - RS - Brazil �Particles coming fromthe space reach our atmosphere at all moment and couldcome with extremely high energy of orders of 1020 eV andbecause of this are called Ultra High Energy Cosmic Rays(UHECR). In the interaction of these cosmic rays withthe atmosphere, we have process with energy higher thanenergy of laboratories.As a result of the interaction of the UHECR with the at-mosphere, partonic air showers appear. Analyzing the cons-titution of this air shower, we have that one of final pro-ducts are pair of leptons, the dileptons. Evaluate the rateof dileptons produced directly in this process is a method ofinvestigation of the high density effect at extreme energy.Considering the fundamental structure of the protons, neu-trons, etc. the collision occurs with the fundamental par-ticles (quarks and gluons), and the produced dileptons areoriginated in a annihilation quark-antiquark process, thatcomes from the cosmic rays and of the atoms of the at-mosphere. This is the Drell-Yan process investigated inthis work.The dipole approach is used as the theoretical model forcalculation of cross sections. In this formalism, the inte-raction between projectile and target is considered through

the dipole cross section σdip. This interaction depends onthe density of particles in the target and any saturationeffect is included in this cross section.In this study we investigated the Drell-Yan process consi-dering mass and transverse momentum of dileptons produ-ced at LHC and UHECR energies. A comparison betweenmodels of σdip proposed by Golec-Biernat and Wusthoff(GBW) and Albacete ET. AL. (RCBK), that describe thephysics of partonic saturation, are performed. For compa-rison, we calculate the cross section for production of di-leptons using the first order expansion in the GBW, wheresaturation effects are not present.

[23/04/12 - P020]Relation between Tcc,bb and Xc,b from QCD,Jorgivan M. Dias

1, Stephan Narison

2, Fernando

Silveira Navarra1, Marina Nielsen

1, Jean-Marc

Richard3,

1 Grupo de Hadrons e Fısica Teorica, Insti-tuto de Fısica, Universidade de Sao Paulo; 2 LaboratoireParticules et Univers Montpellier; 3 Institut de PhysiqueNucleaire de Lyon, Universite de Lyon �We use doubleratio of Quantum Chromodynamics (spectral) sum rules, tostudy the ratio rTcc/X between masses of Tcc and X(3872)structures assuming that they are described by the D−D∗

and D−D∗ molecular currents, respectively. In this appro-ach and within our approximation, we found that the mas-ses of these two states are almost degenerated. Besides,considering that these two states are mesons, we use theOne Pion-Exchange Potential (OPEP) approach to studythe long range part of the interaction between the consti-tuents of these two mesons. We conclude that one pion-exchange interaction is different when we compare both ca-ses. In addition, if the observed Belle resonance X(3872)is a DD∗ + c.c. molecule, then the DD∗ molecule shouldexists with approximately the same mass. We have stu-died an extension for the case including bottom quark. Inthis situation, our results indicates the same conclusion ear-lier. Considering that the light quark-antiquark pair is thestrange quark, we also study the SU(3) breaking for theT sQQ and TQQ mass ratios. Motivated by the recent Belleobservation of two Zb states, we revise our calculation ofthe Xb using the combination of results from exponentialand Finite Energy sum rules.

[23/04/12 - P021]Inclusive production of dijets at the LHeC,Maria Beatriz de Leone Gay Ducati, ,

Mirian Thurow Griep, Magno Valerio Trin-

dade Machado, Universidade Federal do Rio Grandedo Sul - RS - Brazil �The upcoming Large HadronElectron Collider (LHeC) will reach energies higher thanthe available at DESY HERA experiment. This fact willopen a new regime to probe the gluon and sea quarkdistributions in nucleon and on nucleus. In deep inelasticscattering in lepton-hadron colliders, events with two jetsand the scattered proton in the final state are predicted tobe observable, with an important contribution from charmproduction. Therefore, we investigate the production of aquark-antiquark pair in inclusive photon-proton scattering.We compute the angular distribution of a quark-antiquarkpair production in inclusive photon-proton scatteringconsidering two differents unintegrated gluon distributions.


One is based on the idea of gluon saturation and growsslowly with the dipole size. In the other the saturationscale Q0 roughly represents the inverse size of the hadronand because hadrons are colorless all gluons with a wavelength larger than the size of the hadron decouple. ThePomeron intercept is a scale Q2-dependent. It takes careof the experimental fact that the small-x rise becomesweaker when the scale decreases and and finally turns intothe soft behavior below Q0. The angular distribution inthis process have a strong dependence on the unintegratedgluon function model. Then, it can be used to determinethe gluon distribution.

[23/04/12 - P022]Production of the mixed molecule-charmoniumX(3872) in B decays, C.M. Zanetti, , M. Nielsen,

IF - USP - SP - Brazil, R. D. Matheus, IFT - UNESP -SP - Brazil �The QCD spectral sum rules (QCDSR) areused to calculate the branching ratio for the production ofthe exotic state X(3872) when it is assumed to be a mix-ture between charmonium [cc] and exotic molecular [cq][qc]states with JPC = 1++. We calculate the three point cor-relator for the B − X − K vertex in order to study theB → X(3872)K channel and find that the branching ratioB(B → XK) = (1.00± 0.68)× 10−5 is obtained in a smallrange for the values of the mixing angle: 5◦ ≤ θ ≤ 13◦.This branching ratio is in agreement with the experimentalupper limit. This result is compatible with the analysis ofthe mass and decay width of the mode J/ψ(nπ) and the ra-diative decay mode J/ψγ performed in the same approachand with the same mixing angle. The interpretation of theX(3872) as a mixed charmonium-molecular state is greatlystrengthened, since these three independent processes allfavor the same interpolating current and the same limitedrange for the mixing angle.

[23/04/12 - P023]Bound states in a glueball-glueball potential,Carla Novello, UNIPAMPA - RS - Brazil, Mario Luiz

Lopes da Silva, UFPel - RS - Brazil �The gluon self-coupling in QCD opens the possibility of existing boundstates of pure gauge fields known as glueballs. Glueballsare predicted by many models and by lattice calculations.Many mesons have stood up as good candidates for thelightest glueball in the spectrum and in particular the sca-lar sector seems promising. Although technical difficultiesstill trouble our understanding of glueball properties in ex-periments, largely because glueball states can mix stronglywith nearby qq resonances. In the literature possible mi-xing scenarios with JPC = 0++ qq nonet with the lowestmass glueball is considered for three established resonancesf0(1370), f0(1500) and f0(1710).A mapping technique known as the Fock-Tani formalismhas been developed in hadron physics to deal with scat-tering of composite particles with constituent interchange.The Fock-Tani formalism is used to derive in the context ofa constituent gluon model an effective Hamiltonian that in-volves explicit gluon degrees of freedom. We study glueballswith two gluons using this formalism. The glueball-glueballpotential can be obtained in the context of the constituentgluon model, with gluon interchange.The glueball-glueball potential is deep, on this way one can

calculate bound states for the potential. The bound statescan be compared with experimental resonances.

[23/04/12 - P024]Meson production in two-photon interactionsat LHC energies, VICTOR PAULO BARROS

GONCALVES, , WERNER KRAMBECK SAUTER,

DANIEL TAVARES DA SILVA, Instituto de Fısica eMatematica, Universidade Federal de Pelotas - UFPel - RS- Brazil �The Large Hadron Collider (LHC) at CERNstarted two years ago. During this period a large amountof data have been collected considering pp collisions at

√s

= 0.9, 2.36 and 7 TeV as well as PbPb collisions at√s

= 2.76 TeV. Currently, there is a great expectation thatLHC will discover the Higgs boson and whatever new phy-sics beyond the Standard Model that may accompany it,such as supersymmetry or extra dimensions. However, weshould remember that LHC opens a new kinematical re-gime at high energy, where several questions related to thedescription of the high-energy regime of the Quantum Ch-romodynamics (QCD) remain without satisfactory answers.Some open questions are the search for non-qq resonances,the determination of the spectrum of qq states and the iden-tification of states with anomalous γγ couplings. A possibleway to study these problems is the study of meson produc-tion in two-photon interactions. In general, this process isstudied in leptonic colliders. An alternative is to use thatultra-relativistic protons and nuclei give rise to strong elec-tromagnetic fields and estimate the production of a givenfinal state considering the photon - photon and photon -hadron interactions. In particular, it is possible to studyphoton - photon interactions in proton - proton and nu-cleus - nucleus collisions at LHC. In this contribution wecalculate the meson production in two-photon interactionsat LHC energies considering proton - proton and nucleus- nucleus collisions and estimate the total cross section forthe production of the mesons a, f , η and χ.

[23/04/12 - P025]Photoproduction of scalar mesons at medium ener-gies, M. L. L. da Silva, UFPel - RS - Brazil, M. V. T.

Machado, UFRGS - RS - Brazil �Based on recent Lat-tice QCD results in the charmonium sector, photoproduc-tion appears to be a good place to look for exotic mesons. Inparticular, the photoproduction of scalar mesons at inter-mediate energies could provide an alternative to the directobservation of the radiative decays. From the experimentalpoint of view, the GlueX experiment is being installed andit is located in JLab accelerator. Its primary purpose is tounderstand the nature of confinement in QCD by mappingthe spectrum of exotic mesons generated buy the excitationof the gluonic field binding the quarks. The experimentwill be able to probe new areas by using photoproductionto produce exotic states.Here, we will focus on photoproduction of mesons statesa0(980), f0(1500) and f0(1710). The f0(1500) and f0(1710)mesons will be considered in distinct mixing possibilitiesand assuming that a0(980) is member of the ground-statenonet. The theoretical formalism is the Regge approachwith reggeized ρ and ω exchange. The differential and inte-grated total cross section are computed for the cases of themesons a0(980), f0(1500) and f0(1710) focusing the GlueX


energy regime with photon energy E = 9 GeV. Our resultsindicate that light-quark scalar meson photoproduction iswell suited for studying hybrid mesons structure.

[23/04/12 - P026]pp Scattering at the LHC,Anderson Kendi Kohara, Erasmo Ferreira,

Takeshi Kodama, Instituto de Fisica, UniversidadeFederal do Rio de Janeiro �A careful analysis of therecent pp elastic scattering data at 7 TeV in terms of itsamplitudes has been performed as natural extension ofprevious analysis for lower energies. The disentanglementof the real and imaginary parts is written consistently withconstraints from dispersion relations for amplitudes andfor slopes, and also satisfying the universal asymptoticbehavior for large —t— values due to the three gluonexchange process. Values for the imaginary and real slopesanf for the total cross section at 7 TeV are presented,and the shape of the differential cross section at 14 TeV ,with a dip/bump structure more marked and at a smallervalue of —t— is predicted. It is predicted that futuremeasurements at larger |t| will be connected smoothly withthe perturbative tail observed in the interval 5.5 to 14.2GeV**2 at lower energies and that a marked dip wouldbe observed in p-pbar scattering near this tail range. It isstressed that identification of the amplitudes is essentialfor the consistent description of elastic pp and p-pbar dataand pointed out the importance of future measurementsin the Coulomb interference range and in the transitionrange to the perturbative tail.

[23/04/12 - P027]Relating the nuclear structure function anddiffractive scattering, Fabiana Carvalho,

, IFUSP, Victor P.B. Goncalves, UFPel,Fernando Silveira Navarra, Emmanuel Grave

Oliveira, IFUSP �Very likely, the nuclear structurefunction will be measured at high energies at the electron-ion collider (EIC). This measurement will be of greatrelevance to the understanding of nuclear effects and tothe elucidation of shadowing and gluon saturation. Dataare relevant also because the theory is not yet concludedand there are still some open questions, concerning thecomputation of the nuclear structure functions. Herewe discuss how to calculate FA2 in different approaches.In particular we revisit and update the work ”Nuclearstructure functions at small x from inelastic shadowing anddiffraction”, by N. Armesto, A. Capella, A.B. Kaidalov,J.Lopez-Albacete and C.A. Salgado, Eur.Phys.J. C29(2003) 531-540. In that work FA2 at small x and smallor moderate Q2 was studied using the relation betweenmultiple scattering and diffraction on nucleons, whicharises from Gribov Reggeon Calculus. The γ∗-nucleuscross section was expanded in a multiple scattering seriescontaining the contribution from multiple scatterings.An explicit formula for two scatterings was derived, butnot confronted with the existing experimental data. Weperformed this comparison, which shows that the two-scatterings formula is hopelessly excluded by experimentaldata. A summation of the multiple scatterings is thereforeunavoidable and we use two prescriptions for that. Theresulting expressions are quite successfull in reproducing

the data and therefore useful to make predictions for theEIC. Among the improvements we discuss the effect ofusing the recently obtained rcBK dipole cross-section.

Talks (17h30 - 19h30)

Talks - Session 02

[23/04/12 - 17h30 - Local: Salao Chardonnay]Highly-anisotropic and strongly-dissipative hy-drodynamics and the early-thermalization puzzle,Wojciech Florkowski, Institute of Physics, Jan Kocha-nowski University and H. Niewodniczanski Institute of Nu-clear Physics �It is commonly accepted that the evolutionof the hot and dense matter created in heavy-ion collisionsat the RHIC and LHC energies can be reasonably well des-cribed in the framework of the relativistic hydrodynamicsof a perfect fluid. Nevertheless, the standard hydrodynamicapproach, assuming three dimensional (3D) thermalizationof the system, encounters severe problems concerning initialconditions. The main issue in this respect is to explain thevery early thermalization time of the created system, whichis required by the standard hydrodynamic models to des-cribe the elliptic flow coefficient and the particle transverse-momentum spectra. Recently formulated model of highly-anisotropic and strongly dissipative hydrodynamics is usedto study behavior of matter produced in ultrarelativisticheavy-ion collisions. We search for possible effects of theinitial high anisotropy of pressure on the final soft-hadronicobservables. We find that by appropriate adjustment of theinitial energy density and/or the initial pseudorapidity dis-tributions, the effects of the initial anisotropy of pressuremay be easily compensated and the final hadronic obser-vables become insensitive to early dynamics. Our resultsindicate that the early thermalization assumption is notnecessary to describe hadronic data, in particular, to re-produce the measured elliptic flow v2. The complete ther-malization of matter (local equilibration) may take placeonly at the times of about 1-2 fm/c, in agreement with theresults of microscopic models.

[23/04/12 - 18h00 - Local: Salao Chardonnay]Event-by-event hydrodynamics: a bettertool to study the Quark-Gluon Plasma,Frederique Grassi, IF USP, SP �The Quark-Gluon-Plasma (QGP) created in heavy-ion collisions hasbeen under intense study. In particular, it has beenshown to exhibit almost perfect liquid collective behaviour.Analyses of correlations between particles emitted in ultra-relativistic heavy-ion collisions at large relative ra- pidityreveal azimuthal structure that can be interpreted as solelydue to collective flow. Event-by-event hydrodynamics isa natural framework for studying collective flow. In eachevent, particles are emitted independently according tosome momentum distribution determined by a fluid freezeout surface. In event-by-event hydrodynamics, initialconditions are taken from a microscopic model, whichprovides an energy-momentum tensor. Since local thermalequilibrium is usually not achieved in the microscopicmodel, the energy-momentum tensor is not the one of an


ideal fluid. By switching from the microscopic model tohydrodynamics, one must modify it essentially approxi-mating a yet-unknown thermalization or isotropisationmechanism. In doing so, one must choose quantities tokeep continuous during this transformation, while the restof the energy-momentum tensor necessarily changes dis-continuously. Thus, hydrodynamics has been establishedas a good tool to describe nuclear collisions at RHIC andLHC energies. More recently, it was found necessary to useevent-by-event hydrodynamics (= describe each collisionindividually using hydrodynamics), approach which wasfirst developed in Brazil (SPheRIO collaboration). In thistalk, I discuss which data require the use of event-by-eventhydrodynamics and what we learn on the Quark-GluonPlasma with this.

[23/04/12 - 18h30 - Local: Salao Chardonnay]Self-consistency in non-extensive thermodynamics

of highly excited hadronic states, Airton Deppman,

Instituto de Fisica da Universidade de Sao Paulo �Theself-consistency of a thermodynamical theory for hadronicsystems based on the non-extensive statistics is investiga-ted. We show that it is possible to obtain a self-consistenttheory according to the asymptotic bootstrap principle in-troduced by Hagedorn.In the non-extensive thermodynamics, the partition func-tion for the hadronic system can be written in two differentforms given by

Zq(Vo, T ) =

∫ ∞

0

σ(E)[1 + (q − 1)βE]−q

(q−1) dE (1)

and

ln[1+Zq(Vo, T )] =Vo2π2

∞∑n=1

1

n

∫ ∞

0

dm

∫ ∞

0

dp p2ρ(n;m)[1+(q−1)β√p2 +m2]−

nq(q−1) ,

(2)

where σ(E) is the density of states and ρ(n;m) = ρB(m)−(−1)nρF (m), with ρB(m) and ρF (m) being, respectively,the mass spectrum for bosons and fermions. In the equati-ons above, β is the inverse of the effective temperature andq is the entropic parameter. Since experiments have shownthat q > 1, this restriction is adopted.According to the bootstrap principle, both forms of the par-tition function are identical if appropriate density of statesand mass spectra are used with the restriction that asymp-toticaly we must have

ln[σ(x)] → ln[ρ(x)] , (3)

for x→ ∞.We show that the self-consistency is achieved if the asymp-totic forms for the mass spectrum and for the energy den-sity are, respectivelly,

ρ(m) → γm−5/2[1 + (qo − 1)m]βo

qo−1

and

σ(E) → bEa[1 + (qo − 1)E

] βoqo−1 ,

where a, b and γ are constants and qo > 1. In addition wehave

a+ 1 =γVo

2π2(β)3/2,

with Vo being the interaction volume.Notice that for qo → 1 the expressions for mass spectrumand energy density approaches the well-known Hagedorn’sresults.

With these choices we get the following asymptotic formfor the partition function:

Zq(Vo, T ) →(

1

β − βo

)a+1

. (4)

From here it follows that there is an inferior limit for β cor-responding to a limiting effective temperature To = 1/βo.We show that these results are in agreement with experi-mental data for p + p, A + A and e + e ultrarelativisticcollisions.

[23/04/12 - 19h00 - Local: Salao Chardonnay]Thermal Bottomonium Suppression,Michael Strickland, Gettysburg College, PhysicsDepartment �I will discuss my recent work on thermalheavy quarkonium suppression focusing on bottomonium.The thermal suppression of heavy quark bound statesrepresents an ideal observable for determining if one hasproduced a quark gluon plasma in ultrarelativistic heavy-ion collisions. In recent years, however, a paradigm shifthas taken place in the theory of quarkonium suppressiondue to new first principles calculations of the thermalwidths of these states. These thermal widths are large,eg O(20-100 MeV) for the Upsilon, and cause in-mediumsuppression of the states at temperatures below theirtraditional disassociation temperatures. In order to applythe newly developed understanding to phenomenology,however, one must make detailed space-time models of theplasma including the effects of finite shear viscosity. Theseeffects include not only the modification of the time evolu-tion of the temperature of the system, flow, etc., but alsothe evolution of potentially large local momentum-spaceanisotropies which can dramatically affect the in-mediumproperties of the states. I will present comparisons of


theory with data from RHIC 200 GeV/nucleon Au-Aucollisions and LHC 2.76 TeV/nucleon Pb-Pb collisions as afunction of number of participants, rapidity, and transversemomentum. I will show that theoretical calculations arein reasonably good agreement with data obtained at bothcollision energies.



Lecture: Petreczky I

[24/04/12 - 09h00 - Local: Salao Chardonnay]QCD at non-zero temperature : status and pros-pects, Peter Petreczky, Brookhaven National Labo-ratoty, USA �I am going to review several topics in lat-tice QCD at non-zero temperature. I will discuss deconfi-ning and chiral aspects of the finite temperature transitionin QCD, and the role of universality (scaling) in descri-bing the chiral transition and in the determination of thecorresponding transition temperature. I will also mentionthe effective restoration of UA(1) symmetry at high tem-peratures. The deconfining aspects of the transition willbe discussed in terms of fluctuations of conserved charges,that are sensitive to the underlying degrees of freedom, andonset of color screening. The present status of the calcula-tions of equation of state will be reviewed. The results ofthe lattice calculations will be compared to the calculationsobtained using weak coupling techniques as well as withthe predictions of Hadron Resonance Gas (HRG) model.The comparison with the weak coupling results is impor-tant for establishing the temperature range where quarkgluon plasma can be considered as weakly coupled, whilecomparison with HRG is important to test the validity ofeffective models. Finally, I will review progress made in cal-culating meson correlation functions and extracting trans-port coefficients. In particular, I will address the questionof melting of quarkonium states in quark gluon plasma.


Lecture: Kovchegov II


















Lecture: Lipari II


INFN and Dipartimento di Fisica University of Roma, Italy�These lectures want to give an introduction to the presentstatus of Astroparticle Physics, giving special emphasis to adiscussion of the importance of the description of hadronicinteractions in the interpretation of the observations of cos-mic rays at the highest energy. Over recent years there hasbeen marked growth in interest in the study of techniquesof cosmic ray physics by astrophysicists and particle physi-cists. Cosmic radiation is important for the astrophysicistbecause in the farther reaches of the universe. For particlephysicists, it provides the opportunity to study neutrinosand very high energy particles of galactic origin. More im-portantly, cosmic rays constitue the background, and insome cases possibly the signal, for the more exotic uncon-firmed hypothesized particles such as monopoles and spar-ticles. Focusing on the highest energy cosmic rays, theselectures describe where they originate, acquire energy, andinteract, in accreting neutron stars, supernova remnants,in large-scale shock waves. It is reviewed also their inte-ractions in the atmosphere and in the earth, how they arestudied in surface and very large underground detectors,and what they tell us. The lectures will include a summaryof recent results in cosmic rays, gamma astronomy and neu-trino astronomy, and a brief discussion of the study of thenature of Dark Matter from observations of cosmic ray flu-xes. The study of the cosmic rays at the highest energiesrequires the modeling of hadronic interactions up to a c.m.energy of 400 TeV. Measurements at LHC can help in theextrapolation to these energies.

Talks (15h - 17h)

Talks - Session 03

[24/04/12 - 15h00 - Local: Salao Chardonnay]Chiral Quark Models with Polyakov loops at fi-nite temperature, Enrique Ruiz Arriola, Universi-dad de Granada, Spain �We describe results [1] for the


confinement-deconfinement phase transition as predictedby the Nambu–Jona-Lasinio model where the local andquantum Polyakov loop is coupled to the constituent quarksin a minimal way (PNJL). We observe that the leading cor-relation of two Polyakov loops describes the chiral transi-tion accurately. The effects of the current quark mass onthe transition are also analysed.We also address a possible relation between the expecta-tion value of the Polyakov loop in pure gluodynamics andfull QCD based on Polyakov Chiral Quark Models whereconstituent quarks and the Polyakov loop are coupled in aminimal way [2,3]. To this end we use a center symmetrybreaking Gaussian model for the Polyakov loop distributionwhich accurately reproduces gluodynamics data above thephase transition in terms of dimension 2 gluon condensate.The role played by the quantum and local nature of thePolyakov loop [4] is emphasized on the light of more recentfindings [5].References:[1] E. Megias, E. Ruiz Arriola and L.L. Salcedo, Phys.Rev.D74 (2006) 065005, JHEP 0601 (2006) 073,[2] E. Megias, E. Ruiz Arriola and L.L. Salcedo, JHEP 0601(2006) 073,[3] E. Megias, E. Ruiz Arriola and L.L. Salcedo, Eur.Phys.J.A31 (2007) 553-556,[4] E. Megias, E. Ruiz Arriola and L.L. Salcedo, AIPConf.Proc. 892 (2007) 444-447[5] E. Megias, E. Ruiz Arriola and L.L. Salcedo, ar-Xiv:1204.2424 [hep-ph]

[24/04/12 - 15h30 - Local: Salao Chardonnay]Chiral symmetry breaking with a confiningpropagator and dynamically massive gluons,Adriano Natale, IFT - UNESP, SP �QCD has twomain properties: the chiral symmetry breaking (CSB)or dynamical quark mass generation and confinement ofquarks and gluons. Both phenomena are related to thenonperturbative infrared (IR) dynamics. The most usualnon-perturbative method to study these properties is QCDsimulation on the lattice, but it is also possible to studydynamical mass generation in the continuous space-timethrough Schwinger-Dyson equations (SDE). Another fun-damental QCD property is that the gluon may have a dy-namically generated mass. Chiral symmetry breaking inQCD is studied introducing a confining effective propaga-tor, as proposed recently by Cornwall, and considering theeffect of dynamically massive gluons. The effective confi-ning propagator has the form 1/(k2 +m2)2 and we studythe bifurcation equation finding limits on the parameter mbelow which a satisfactory fermion mass solution is genera-ted. Since the coupling constant and gluon propagator aredamped in the infrared, due to the presence of a dynamicalgluon mass, the major part of the chiral breaking is only dueto the confining propagator and related to the low momen-tum region of the gap equation. We study the asymptoticbehavior of the gap equation containing this confinementeffect and massive gluon exchange, and find that the sym-metry breaking can be approximated by an effective four-fermion interaction generated by the confining propagator.We compute some QCD chiral parameters as a function ofm, finding values compatible with the experimental data.

We find a simple approximate relation between the fermioncondensate and dynamical mass for a given representationas a function of the parameters appearing in the effectiveconfining propagator.

[24/04/12 - 16h00 - Local: Salao Chardonnay]Lattice gluon propagator and deconfinement, At-

tilio Cucchieri, , Tereza Mendes, University of SaoPaulo �Debye screening of the color charge, expected athigh temperature, is signaled by screening masses/lengthsthat can in principle be obtained from the gluon propagator(see e.g. [1]). We investigate the critical behavior of electricand magnetic gluon propagators and try to characterize thescreening masses around the transition temperature Tc byperforming large-lattice simulations in pure SU(2) gaugetheory. In particular, we use the knowledge gained in thestudy of the zero-temperature gluon propagator (see [2] fora review) to identify systematic effects in the infrared limitand to define temperature-dependent masses for the regionaround and below Tc. We see that the electric propaga-tor gets enhanced when going from zero to nonzero tem-perature, with an apparent plateau value in the infrared,while the magnetic propagator becomes progressively moreinfrared-suppressed, with a clear turnover in momentumat all nonzero temperatures considered. Severe systema-tic effects are observed for the electric propagator aroundTc, suggesting that lattices of temporal extent Nt > 8 areneeded for this study. Once these errors are removed, thedata support a finite maximum for the infrared value of theelectric propagator as a function of the temperature.

References

[1] A. Cucchieri, F. Karsch, P. Petreczky, Phys. Rev. D 64,036001 (2001).[2] A. Cucchieri and T. Mendes, PoS QCD -TNT09, 026(2009) [arXiv:1001.2584 [hep-lat]].

[24/04/12 - 16h30 - Local: Salao Chardonnay]Electric Dipole Moments of Light Nuclei fromChiral Effective Field Theory, J. de Vries, ,

KVI/University of Groningen, The Netherlands, R. Higa,

Instituto de Fisica, USP, C.-P. Liu, Department of Phy-sics, National Dong Hwa University, Taiwan, E. Me-

reghetti, Department of Physics, University of Ari-zona, USA, I. Stetcu, Department of Physics, Uni-versity of Washington, USA, R. G. E. Timmermans,

KVI/University of Groningen, The Netherlands, U. van

Kolck, Department of Physics, University of Arizona,USA �It is known that the current Standard Model ofparticle physics does not provide a violation of parity (P)and charge-conjugation (C) symmetries enough to accountfor the imbalance of matter over anti-matter in the uni-verse. This amount of CP-violation needed, normally pre-sent in Standard Model extensions, can manifest itself in arelatively large electric dipole moment of light nuclei. Toaddress this issue, we use Effective Field Theory techni-ques to build up the leading and most general interactionsthat violate time-reversal (T) invariance or, assuming theCPT theorem, CP-violation. At the quark-gluon level, weincorporate effects from the QCD θ-term and dimension-


six operators, representative of physics beyond the Stan-dard Model. A next layer of Effective Field Theory is thenbuild, which explore the low-energy chiral hadrodynamicsto combine these beyond the Standard Model terms intosix T-violating low-energy constants that appear in the nu-clear potential and currents. We argue that, at leadingorder, the electric dipole moments of light nuclei is expres-sed in terms of these six low-energy constants. We explorethis possibility by computing the electric dipole momentsof some light nuclei at leading order, namely, the deute-ron, the triton, and Helium-3. As the six T-violating low-energy constants contribute to those systems with differentweights, eventual non-zero measurements of the mentionedelectric dipole moments would allow one to disentangle thestrength of different sources beyond the ones already pre-sent in the Standard Model.


Posters - Session B

[24/04/12 - P001]Renormalization of the Brazilian Chiral Nucleon-Nucleon Potential, Carlos Antonio da Rocha,

Universidade Sao Judas Tadeu - USJT-SP �Evaluationof nucleon-nucleon scattering observables requires a renor-malization procedure in order to obtain a finite T-matrixfrom a given nucleon-nucleon potential. Therefore, to geta good prediction of the scattering observables, it is neces-sary to use a trustful NN potential.A considerable refinement in the description of nuclear in-teractions has occurred in the last 20 years, due to thesystematic use of chiral symmetry. Initially, the symmetrywas realized by means of non-linear Lagrangians contai-ning only pions and nucleons [1]. The next level of thechiral Two-Pion Exchange Potential (TPEP) was obtai-ned by using empirical information about the low energyπN amplitude, which is normally summarized by means ofsubthreshold coefficients, which can be used either directlyin the construction of the TPEP or to determine unknowncoupling constants (low-energy constants-LEC’s) in chiralLagrangians [2,3].The Brazilian Chiral NN potential explored here developsa relativistic procedure for the chiral expansion of the two-pion exchange component of the potential, which emphasi-zes the role of intermediate πN subamplitudes. Moreover,it includes explicitly the two-pion exchange correlations gi-ven by the 4π vertex. The renormalization procedure isimplemented by the subtractive renormalization method.This method consists of subtractions in the kernel of theLS equation, at a given energy scale [4]. Depending on howthe potential diverges, one or more subtractions are needed.Our goal here is to apply the subtractive renormalizationmethod with the Brazilian potential [2]. The main diffe-rence between the Brazilian Chiral NN potential and otherchiral potentials is that it includes pion correlations withinthe two-pion exchange potential (TPEP) sector, calcula-ted using the pion-nucleon amplitude with off-shell pions.The final expressions for the potential are tested against theHeavy-Baryon chiral next-to-next-to-leading order (NNLO)

potential from Epelbaum, Gloeckle and Meissner[5].References[1.] C.A. da Rocha and M.R. Robilotta, Phys. Rev. C49,1818 (1994).[2.] R. Higa and M.R. Robilotta, Phys. Rev. C68, 024004(2003).[3.] R. Higa, M.R. Robilotta, and C.A. da Rocha, Phys.Rev. C69 , 034009 (2004).[4.] T. Frederico, V, S. Timoteo, and L. Tomio Nucl. Phys.A653, :209 (1999); V.S. Timoteo, T. Frederico, A. Delfino,and L. Tomio, Phys. Lett. B 621, 109 (2005); Nucl. Phys.A790, 406 (2007)[5.] E. Epelbaum, W. Gloeckle and Ulf-G. Meissner, Nucl.Phys. A747, 362 (2005).

[24/04/12 - P002]Reliability of the Optimized perturbation the-ory for scalar fields at finite temperature,Ricardo Luciano Sonego Farias, Daniel Lombelo

Teixeira Junior, Rudnei de Oliveira Ramos, UFSJ-UFSJ-UERJ �Many efforts have been dedicated to un-derstand the behaviour of relativistic field theories at fi-nite temperatures. Phase transition phenomena in quan-tum field theories are typically of nonperturbative natureand thus naive perturbation theory based on an expansionin the coupling constant cannot be employed. This is cle-arly the case of phase changes at high temperatures, whereperturbation theory becomes unreliable because powers ofthe coupling constant become surmounted by powers of thetemperature. Problems with perturbation theory also hap-pen in phenomena occurring close to critical points, becauselarge fluctuations can emerge in the system due to infra-red divergences, thus requiring nonperturbative methodsas well in their studies. Typical examples where these pro-blems can manifest are in studies of symmetry changingphenomena in a hot and dense medium, a subject of inte-rest in quantum chromodynamics (QCD) in the context ofheavy-ion collision experiments, and also in studies of theearly universe. Consequently, there is a great deal of inte-rest in investigating thermal field theories describing matterunder extreme condition. In this work the thermodynamicsof a scalar field with a quartic interaction is studied withOptimized Perturbation Theory (OPT), the free energy isevaluated up to third order in OPT. Applying the optimiza-tion procedure in the free energy, nonperturtive results aregenerated and we use to evaluate the pressure and otherthermodynamic quantities. We discuss the reliability ofour results for this model and perform a comparison withother nonperturbative approaches, like Screened Perturba-tion Theory, and with usual perturbation theory.

[24/04/12 - P003]Electromagnetic Structure of the Meson Pion,Jose de Paulo Cruz Filho, Clayton Santos

Mello, Edson Otoniel da Silva, J. P. B. C.

de Melo and Victo S. Filho, LFTC, UniversidadeCruzeiro do Sul - SP - Brazil �In this work we analyzethe electromagnetic structure of the meson pion, whichis an elementary particle composed by a quark-antiquarkbound state. In the study of such a meson, we consider inparticular the calculation of important observables as itselectromagnetic radius and its electromagnetic form factor


in low and intermediate energies range.In order to do that, we can use the formalism of usualquantum field theory and the light cone formalism, withthe aim of testing the properties of QCD non-perturbativeregime. In the case of this particle, the electromagneticform factor and the electromagnetic radius can be obtainedusing a theoretical model of constituent quarks of the pion.Specifically, such calculations are executed in the formalismof light front field theory, by considering the symmetricalvertex or the non-symmetrical vertex models.In special, we have calculated in an optimized way, byvarying the regulator mass of the model, the electromagne-tic form factor of the meson pion, by using the nonsymme-trical vertex model in the light-front theory formalism.Further, it can be also used other calculations models, byconsidering different wave functions of the particle for com-parison. The theoretical calculations should be checkedwith the most recent experimental data involving measure-ments of electromagnetic form factors in order to check thedegree of agreement between them.

[24/04/12 - P004]Chiral Symmetry in a Hot and Dense MagneticMedium, Gabriel Neves Ferrari, Marcus Benghi

Pinto, Departamento de Fısica, Universidade Federalde Santa Catarina, Florianopolis, Santa Catarina, Bra-sil �One of the most relevant research subjects of con-temporary physics is related to the determination of thephase structure of the quantum-chromodynamics theory(QCD). Is has been suggested that at finite temperatures(T ) and/or chemical potentials (μ) quarks could leave thehadronic phase to reach the quark-gluon plasma (QGP),that probably existed in the early universe.In general, due to technical difficulties associated withphase transitions in QCD, many effective models have beenused (e.g. Gross-Neveu (GN), Nambu-Jona-Lasinio (NJL),MIT Bag Model, Sigma Linear Model coupled to quarks(LSMq), etc.). The control parametres T and μ rule the chi-ral transition, and the regime μ = 0 at high temperatureshas been largely studied. There is a consensus with respectto the character of the restoration of the chiral symmetrywith most studies estipulating the existence of a crossover.On the other hand, it has been conjectured that strongmagnetic fields (B � 1019 G) could be created in non-central collisions that occur in experiments realized atRHIC (Relativistic Heavy Ion Collider) and at LHC (LargeHadron Collider), in which the goal is the creation of theQGP. To study the effects of this magnetic field in the res-toration of the chiral symmetry, many developments in dif-ferent models showed that with B �= 0 and μ = 0 there isa crossover for high values of T . The magnitude of T forμ = 0 appears to grow with the magnetic field in most ofthese works.Due to the fact that our theory has fermions under a mag-netic field and that we are studying the chiral symmetry,we will analyse how the phenomenum of the magnetic ca-talysis influences the chiral transition. Here, we also studythe thermal dependence of the mesonic masses and deve-lop the thermodynamics of the system with and withoutmagnetic fields, with the purpose of analyzing physical ob-servables. Considering the LSMq at μ �= 0, we will extend

the results found on the literature, exploring the phase dia-gram in whole plane T −μ. We will analyze the behavior ofthe critical point with vanishing magnetic fields, verifyingthe influence exerted by the fermionic vacuum. As we havea consensus about B = 0, we will investigate its effects onthe phase diagram and will contrast our results with thosein which only vanishing baryonic densities were taken intoaccount.

Keywords: Phase Transitions in Quantum Field Theory,Chiral Symmetry, QCD Phase Diagram.

[24/04/12 - P005]Emergence of Multiple Critical Points in the NJLModel with Vector Coupling, Robson Z. Denke,

Juan Camilo Macias, Marcus Benghi Pinto, Depar-tamento de Fısica - Universidade Federal de Santa Cata-rina �Up to now, most of the theoretical studies aboutthe QCD phase diagram, indicate the existence of a cri-tical point separating the region characterized by a firstorder transition from that which goes through a crossovertype. However, a work done by de Forcrand and Philipsen,showed an unexpected result obtained from a lattice calcu-lation at imaginary chemical potential. Precedent resultssupport the hypothesis that the first order region shouldexpand along the mu,d −ms plane when the chemical po-tential increases. If one considers a line passing throughthe coordinates of physical bare masses of quarks, this linemust hit the correspondent point at the critical surface.The result of de Forcrand and Philipsen predicts converselya shrinkage of the first order region and the consequent di-sappearance of the critical point. In order to give an expla-nation to this disagreement, Fukushima argued that initi-ally, a vector-like interaction could reverse this shrinkage,as the chemical potential increases, the expansion of thefirst order region would be restarted. This back-bendingof the critical surface would produce two critical points atsmall values of quark bare masses. Considering thermalfluctuations in the Linear Sigma Model framework, Bow-man and Kapusta were able to show that at small valuesof pion mass, two critical points are present in the QCDphase diagram, as would be observed in the back-bendingscenario A previous study, making use of the OptimizedPerturbation Theory (OPT) and the standard SU(2) NJLhave also found a similar result with the emergence of mul-tiple critical points only in the OPT method.In this work, we study the influence of a vector like con-tribution to the SU(2) Nambu–Jona-Lasinio Model in thecontext of a large-N mean field aproximation when small fi-nite pion masses (quark current mass) are considered. Ourfindings resulted in the observation of two critical pointsin the QCD phase diagram in the limit of strong couplingwhen a vector interaction channel is regarded. The incre-ase of vector coupling has the effect of weakening the firstorder region. By varying the quark current mass, we obser-ved that the second critical point must disappear if its valueapproaches to physical ones. This reinforces the arguments


of Fukushima and reconcile the contradictory results.

[24/04/12 - P006]A heuristic approach for accessing and employingthe infrared behavior of Yang-Mills correlationfunctions, Fatima Araujo Machado, Adriano Na-

tale, IFT/UNESP - SP - Brazil �This work analysesa hypothetically improved perturbative approach taking adressed massive-like gluon propagator and an effective cou-pling into account. It is motivated by the idea of buil-ding a bridge between nonperturbative studies of QCD andtheir application to physical processes, and aims towardsapplying infrared qualities of QCD to its phenomenology.As this would be a greatly thorough endeavor, the presentwork consists in an early step for it, and is considered aheuristic one in the sense that it is a prototype built toexplore the issues and conditions that can make its failureor success. So, we have calculated 1-loop corrections to theghost and gluon propagators, and the ghost-gluon vertex inthe Landau gauge, pure SU(3) Yang-Mills theory, howeverwith the distinction that the gluon propagators inside lo-ops were taken to be massive. Furthermore, we noticed therelevance of the QCD coupling for the task pursued, andverified that the use of an effective charge provided betterresults. The purpose in this particular and simpler casewas to see whether such a distinct expansion could accessthe infrared domain, approximating the complete, nonper-turbative behavior of those Green’s functions as calculatedin the lattice. In this sense, the comparison between ourresults and lattice ones was satisfactory.

[24/04/12 - P007]Long Distance Symmetries for Nuclear For-ces and the Similarity Renormalization Group,Sergio Szpigel, Centro de Ciencias e Humanidades,Universidade Presbiteriana Mackenzie, Sao Paulo Brasil,Varese Salvador Timoteo, Faculdade de Tecnologia,Universidade Estadual de Campinas, Limeira, Brasil, En-rique Ruiz Arriola, Departamento de Fısica Atomica,Molecular e Nuclear, Universidad de Granada, Granada,Spain �Long distance symmetries in Nuclear Physics, suchas the Wigner SU(4) spin-flavour and the Serber symme-tries, are symmetries of the nuclear force broken only atvery small distances. They can be defined as symmetriesof an effective nucleon-nucleon (NN) interaction which arenot displayed by the corresponding bare NN interaction. Inthe context of the renormalization group this correspondsto symmetries of the NN potential which are broken byshort-distance counterterms. In this work we study theemergence of long distance symmetry patterns within theframework of the similarity renormalization group (SRG)approach, a renormalization method based on a series ofcontinuous unitary transformations that evolve hamiltoni-ans with a cutoff on energy differences. Viewing the hamil-tonian as a matrix in a given basis, the similarity transfor-mations suppress off-diagonal matrix elements as the SRGcutoff is lowered, forcing the hamiltonian towards a band-diagonal form. We show that for a SRG cutoff of about600 MeV there is an extremely accurate fulfillment of thesymmetry pattern of the Wigner SU(4) symmetry in par-tial wave channels with even angular momentum, as wellas the Serber symmetry in partial wave channels with odd

angular momentum. Since the SRG tranformation evolvesthe potentials to phase-shift equivalent forms, our resultssuggest a representation of the NN interaction based expli-citly on the symmetry, which will have some implicationsfor Nuclear Structure and Nuclear Reactions.

[24/04/12 - P008]Non perturbative description of self-interactingcharged scalar field at finite temperature andin the presence of an external magnetic field,Dyana Cristine Duarte, Ricardo Luciano Sonego

Farias, Universidade Federal de Sao Joao del Rei, Rud-

nei de Oliveira Ramos, Universidade do Estado do Riode Janeiro �Phase transition phenomena in spontaneouslybroken quantum field theories have long been a subject ofimportance and interest due to their wide range of possi-ble applications, going from low energy phenomena in con-densed matter systems to high energy phase transitions inparticle physics and cosmology. In addition to thermal ef-fects, phase transition phenomena are also known to betriggered by other external effects, like, for example, by ex-ternal fields. In particular, those changes caused by exter-nal magnetic fields have attracted considerable attention inthe past and received reinvigorated interest recently, mostlybecause of the physics associated with heavy-ion collisionexperiments. In this work we have revisited the phase tran-sition problem for the self-interacting complex scalar fieldmodel when thermal effects and an external magnetic fieldare present. We have studied this problem in the contextof the nonperturbative method of the optimized perturba-tion theory (OPT). We have shown that the OPT methodpreserves the Goldstone theorem and that carrying out theapproximation to first order is analogous to the ring dia-gram resummation method. By using the OPT method, wehave demonstrated that the phase transition in the modelis always second order in the presence of thermal effectsand by including an external magnetic field, there is nochange to the phase transition order. The effect of the ex-ternal magnetic field is to strengthen the symmetry brokenphase, producing a larger expectation value for the fieldand also a larger critical temperature. As an aside, buta complementary part of this work, we have verified thereliability of the use of the Euler-Maclaurin formula as anapproximation for the sum over Landau energies in a mag-netic field. The low magnetic field region is typically theregion where we have to face the problem of summing oververy larger number of Landau levels, which, in practice,can be overwhelming in terms of CPU time, when workingnumerically. The EM formula in this case can be a veryvaluable tool, both for numerical computations, but alsofor obtaining approximate analytical results, which wouldbe otherwise very difficult through the use of the Landausums directly.

[24/04/12 - P009]Quark loop effects on the gluon propagator,Arlene Cristina Aguilar, Universidade Federal doABC, Daniele Binosi, ECT*, Trento Italy, Joannis Pa-

pavassiliou, University of Valencia, Spain �We estimatethe modifications induced to the quenched gluon propaga-tor due to the presence of a small number of quark loops.The main ingredient of this calculation are the dynami-


cal quark propagators obtained from the solution of thecorresponding gap equation (the quark Schwinger-Dysonequation), which are subsequently fed into the quark lo-ops contributing to the gluon self-energy. Gauge invarianceis preserved by employing two standard forms of the non-perturbative quark-gluon vertex, namely the Ball-Chiu andCurtis-Pennington Ansatze, which satisfy the exact QED-like Ward identity, special to the PT-BFM scheme, insteadof the Slavnov-Taylor identity of the conventional covari-ant gauges. We compute at the “one-loop-dressed” levelthe nonperturbative contribution of the quark loops to thegluon self-energy in the covariant Landau gauge. Using asnonperturbative input the large volume quenched latticedata for gluon and ghost propagators, we determine howthe overall shape of the gluon propagator and its dressingfunction are affected by the inclusion of the quark loops. Adetailed study of the dependence on the number of flavors,size of the quark masses, renormalization point, and per-turbative limit is presented, and the numerical differencedue to the use of the Ball-Chiu and Curtis-Pennington ex-pressions for the quark-gluon vertex is analyzed.

[24/04/12 - P010]The decay constant and mass of the ρ me-son in self-consistent QCD Sum Rules.,Mikael Souto Maior de Sousa, Romulo Rodri-

gues da Silva, Universidade Federal de Campina Grande�Obtaining the theoretical mass and the decay constantsis one of the most important topics in hadron physics,since the emergence of quantum chromodynamic (QCD)in the mid 1970. Currently, this problem has been solvedby several formalisms, in particular: the lattice QCD andthe QCD sum rules (QCDSR). The method of QCDSRwas originally introduced in 1979 by Shifman, Vainshteinand Zakharov, where they got the ρ meson mass anddecay constant of pion and ρ meson. The basic idea of theQCDSR assumes quark-hadron duality which postulatesthe existence of an energy range where a hadron can bedescribed by a interpolating current written in terms ofquarks called the QCD side or a purely hadronic currentthat engages with the ground state of the hadron studiedand its resonances, which we call the phenomenologicalside. In this paper we obtain the mass and decay constantof ρ meson in QCDSR using a self-consistent equationis created by the choose of the continuum thresholds0 = (mρ +Δ)2, where the phenomenological parameter isused the continuum gap Δ = 0.3GeV and we observe theconvergence of the self-consistent equation for 100 loopsand we get good agreement with the experimental valuesfor the decay constant and ρ mass.

[24/04/12 - P011]The decay constant of the ρ(2S) meson,Mikael Souto Maior de Sousa, Romulo Rodri-

gues da Silva, Universidade Federal de Campina Grande�The decay constant is a hadronic observable that canbe obtained by QCD Sum Rules (QCDSR) and its valuecan be compared experimentally through the decay widthof the discharged vector mesons in the process vectormeson decaying in e+e−. This is a great test for QCDSR.According to Particle Data Group, is observed that thedecay width of the J/ψ meson in e+e− occurs in the

range of (5.4 ± 0.22) KeV and the ψ(2S) meson around(2.14 ± 0.21) KeV. For the ρ(1S) meson is observed thatthe decay width is around (7.02 ± 0.11) KeV, but for theρ(2S) has not yet been measured the decay constant so inthis work we present a prediction for ρ(2S) decay constantand a new kind of sum rules, where we consider thephenomenological side has two poles and the continuumthreshold represents a gap between the ρ(2S) and ρ(3S).Based on the information of the decay width of the J/ψand the ψ(2S), we eliminate high values of the continuumthreshold and we estimate a confident value for the decayconstant to ρ(2S) meson. Thus we believe that the ratiobetween the decay widths of the ρ(2S) and ρ(1S) mesonshas the same behavior as the ratio between the decaywidths of the J/ψ and ψ(2S) meson, where the ratio isbigger than one. Where our prediction for Δ = 0.1 GeVwith Borel mass 1≤M≤1.2 GeV is fρ(2S) = (0.17 ± 0.01)GeV.

[24/04/12 - P012]On the possible effects of gluon number fluctuationson γγ collisions at high energies, V. P. Goncalves,

, J. T. de Santana Amaral, Instituto de Fısica e Ma-tematica, UFPel - RS - Brazil �The high energy regimeof Quantum Chromodynamics (QCD) is described by theeffective theory of Color Glass Condensate, whose cen-tral result is the functional evolution equation, the JIM-WLK equation. When applied to the scattering ampli-tude of a simple projectile off a dense target (a CGC), thisequation reproduces the Balitsky hierarchy for the scat-tering amplitudes. In the mean field approximation, thisBalitsky-JIMWLK hierarchy reduces to a single equation,the Balitsky-Kovchegov (BK) equation, which is the sim-plest equation which describes high energy dipole evolutionand scattering in perturbative QCD, and has been shown tobe in the same universality class of a reaction-diffusion pro-cess. As a result of this correspondence between statisticalphysics and the QCD evolution at high energy, it has beenrecently realized that the Balitsky-JIMWLK hierarchy isnot complete because they do not take into account the socalled gluon number fluctuations. Consequently, these arealso completely missed by BK equation. In order to includesuch effects, Balitsky-JIMWLK hierarchy has been genera-lized, giving rise to a new hierarchy of equations, known asthe pomeron loop equations. Besides linear and saturationeffects, these include the gluon number fluctuations, which,at least in the fixed strong coupling case, were recently dis-covered to influence dramatically the high energy evolutionof the amplitudes and some physical quantities. In thiswork, we investigate for the first time the possible effects ofthe fluctuations on the total γγ, γ∗γ∗ cross sections and thereal photon structure function F γ2 (x,Q

2), considering dif-ferent phenomenological models for the dipole-dipole crosssection and scattering amplitude with fluctuations inclu-ded.

[24/04/12 - P013]Short-time dynamics of nonextensive gluodyna-mics, Rafael Bertolini Frigori, UTFPR, Antonio

Mihara, UNIFESP �There is increasing evidence thatthe nonextensive statistical mechanics proposed by Tsallismay be better suited than the canonical Boltzmann-Gibbs


approach to describe physical phenomena presenting strongdynamical correlations, long-range interactions and micros-copic memory effects, as the QGP formation in relativisticheavy-ion collisions. While the nonextensive Tsallis pa-rameter ”q”has been shown to be related to the (almostin thermal equilibrium) coupling of a system to a finite-sized reservoir having a fluctuating temperature, fewer isknown about the physical implications of this parameterover short-time relaxation dynamics.Here we introduce a new heat-bath thermalization algo-rithm for lattice simulations of quenched Yang-Mills the-ory (gluodynamics) in the Tsallis ensemble. A rigorousalgorithmic performance analysis is carried out in two-dimensional equilibrium simulations, where decorrelationtimes are measured for a critical observable and its scallingwith the lattice side is determinated.Then we show how to setup Monte Carlo simulations tostudy the short-time relaxation dynamics of a lattice gaugetheory in the vicinity of its deconfinement phase-transition,thus enabling Static and Dynamical critical exponents tobe computed as a function of ”q”. First-results for theSU(2) lattice gauge theory in (2+1) dimensions within thephenomenologically interesting range of q-Tsallis = [0.9,1.1] and critical coupling are presented, issues concerningensemble equivalence and universality are also addressed.

[24/04/12 - P014]A MAG–Landau interpolating gauge for Yang–Mills theory on the lattice, Antonio Mihara, UNI-FESP/campus Diadema - SP - Brazil �One can find in theliterature a number of approaches proposing different me-chanisms (or ”scenarios”) for confinement. In general eachscenario can be gauge dependent in such a way that the”dynamics”of confinement in one particular scenario canbe very different from another scenario. As a consequenceone can be observe, for instance, distinct infrared behaviorsfor gluon or ghost propagators obtained in different gauges.One possible scenario is the dual color superconductor, inwhich a dual Meissner effect could be responsible for theformation of thin chromoelectric flux tubes between quarksin SU(N) Yang-Mills theories. A similar mechanism of con-finement has been successfully established for the compactU(1) gauge theory: the monopole condensation is respon-sible for confinement. For the application of these ideasto non-Abelian gauge theories it is important to formu-late the theory in terms of its relevant Abelian degrees offreedom. This can be obtained in the Abelian projection:one reduces the SU(N) gauge symmetry to the maximalAbelian (Cartan) U(1)N−1 subgroup by gauge fixing theoff-diagonal components of the gauge field.Other possible scenario of confinement is the so-calledGribov-Zwanziger scenario. In the Landau gauge, the func-tional integration is restricted to the Gribov region Ω,which in turn is the set of gauge field configurations forwhich the Faddeev–Popov operator is positive. The confi-gurations in the Gribov horizon ∂Ω are dominant and deter-mine the infrared behavior of ghost and gluon propagatorsand, as a consequence, of the running coupling constant.An interpolating gauge fixing between the MAG (Maxi-mally Abelian gauge) and the Landau gauge could, in prin-ciple, relate the relevant degrees of freedom for confinement

in one scenario to the ones in the other scenario, contribu-ting to the construction of a gauge independent mechanismof confinement. In this work we propose and analyse a func-tional, on the lattice, which interpolates between MAG andLandau gauge for the Yang–Mills theory. We investigatethe continuum limit of the derivatives of the functional andwe also propose an algorithm for the fixing of such interpo-lating gauge for the Yang–Mills theory on the lattice.

[24/04/12 - P015]Potential Model for Heavy Quarks using GluonPropagators in Landau Gauge obtained from lat-tice simulations, Willian Serenone, Tereza Men-

des, USP - SP - Brazil �Our objective is the study ofbound states of heavy quarks, such as the bottomoniumsystem, from the Schrodinger equation. This approach isvalid since the mass of the heavy quarks is much greaterthan the binding energy of the system and thus the non-relativistic approach is valid. We initially use the potentialknown as Cornell Potential

V (r) = −4

3

αsr

+ k r . (1)

This potential is obtained trough the one gluon exchangeaproximation on the interaction between the quark and theanti-quark, using the propagator

−igμνδαβq2

(2)

On the next step, we change this propagator for the Eucli-dean one obtained in Landau Gauge using lattice simulati-ons

δαβCq2 + s

q4 + u2q2 + t2

(δμν − qμqν

q2

). (3)

The parameters C, s, u and t are determined through a fitfrom the numerical simulation. The potential is determi-ned in this case by numerical intregration. In both cases alinear term is added to account for confinement since theone gluon exchange approximation cannot account quarkconfinement. The proportionality constant k on the linearterm is treated as a free parameter. We search the bestvalue for k trying diverses values for it and for each one,solving numerically the Schrodinger equation. The botto-monium spectra obtained for each value is then comparedwith the experimental Υ masses available on the literature.The k value that best reproduces the observed spectra isthen adopted.

[24/04/12 - P016]Study of the Z(3) symmetry breaking of an effec-tive Polyakov loop model using a worm algorithm,Gastao Krein, , Rafael Leme, Marcio Woitek, IFTUnesp - SP - Brazil �Currently, there is a lack of analy-tical approximation methods for treating QCD in the non-perturbative regime that are at the same time of first prin-ciples and that can be improved systematically. Hence, afair amount of the present understanding of this regime isbased on results of numerical simulations, especially thoseinvolving the use of Monte Carlo (MC) methods within lat-tice QCD [1]. However there are difficulties in the use of


MC methods in problems at finite baryon density, i.e. pro-blems with nonzero baryon chemical potential. This is dueto the so-called complex phase problem (CPP). Basically,the complex-phase problem is characterized by field confi-gurations that contribute with a non-positive weight in thepartition function of the system. These difficulties demandnew computational methods for investigating QCD at finitebaryon densities. In the past few years, interesting possibi-lities have been offered by the worm algorithms [2]. Inspi-red by the graphical representation of the contributions in ahigh-temperature expansion of the partition function, thesealgorithms were originally developed for studying classicalstatistical mechanics models and were later adapted for tre-ating problems in lattice field theory. In order to gain in-sight and develop efficient numerical techniques to tacklethe difficult problem in QCD, it is important to considersimpler models that present a CPP. With this in mind,we discuss the implementation of a worm algorithm in aneffective model for QCD with static quarks. The varia-bles of the model are the SU(3)-valued Polyakov variablesP (x) ∈ Z(3) – Z(3) is the center of SU(3). The CPP issolved by changing to the model’s flux representation, i.e.,by reformulating the problem in terms of new dimer andmonomer variables [3]. We present results [4] for the orderparameter as a function of the temperature for differentvalues of the chemical potential, the phase diagram, thespecific heat and correlation functions.

References:[1] C. Gattringer and C.B Lang, Quantum Chromodyna-mics on the Lattice (Springer, 2010).[2] N. Prokof’ev and B. Svistunov, Phys. Rev. Lett. 87,160601 (2001).[3] Y.D. Mercado, H. G. Evertz and C. Gattringer, Phys.Rev. Lett. 106, 222001 (2011); C. Gattringer, Nucl. Phys.B 850, 242 (2011).[4] G. Krein, R.R. Leme and M. Woitek Jr., in preparation.

[24/04/12 - P017]Nucleation of Quark Matter in the PQM Model,Bruno Werneck Mintz, Universidade Federal do Riode Janeiro, Rudnei de Oliveira Ramos, Universidadedo Estado do Rio de Janeiro, Rainer Stiele, Juergen

Schaffner-Bielich, Ruprecht-Karls Universitat Heidel-berg �We calculate dynamical properties of afirst order quark hadron phase transition at moderateand high baryon chemical potential, as predicted by thePolyakov-Quark-Meson model at the mean- field level.More specifically, assuming that the dynamics of the first-order phase transition close to the coexistence line is ruledby homogeneous nucleation, we use Langer’s theory to cal-culate the properties of the critical bubbles, such as theirradius and surface tension. The coarse-grained free energyof the model is provided by the Polyakov Quark Meson mo-del, a three flavor version of the linear sigma model coupledwith quarks. This model has four order parameters. Theyare the strange condensate (σy), the nonstrange condensate(σx), the expected value of the Polyakov loop (Φ) and itscomplex conjugate (Φ). It is shown that when one of themsuffers a discontinuity (i.e., at a first-order transition), allthe others are also discontinuous. This allows us to define

a new (4-dimensional) order parameter, which is then usedto recast the coarse-grained free energy functional in a waysuitable for calculating nucleation rates and properties ofcritical bubbles. We overestimate the surface tension ofnucleating bubbles within the thin-wall approximation andfind relatively low values, Σ � 15MeV/fm2. This result im-plies that a metastable state, such as a supercooled quark-gluon plasma, quickly decays even in regions relatively closeto the coexistence line of the phase diagram. Possible con-sequences for cosmology and heavy-ion collisions are brifelyoutlined.

[24/04/12 - P018]Investigation of chiral broken and existenceof strange quark stars within the Nambu-Jona-Lasinio model with vector repulsion,Jaziel Goulart Coelho, Constanca Providen-

cia, Manuel Malheiro, Instituto Tecnologico deAeronautica - SP - Brazil; Universidade de Coimbra -Portugal �In this work we study the Nambu-Jona-Lasiniomodel in the SU (3) version with repulsive vector couplingand apply it to quark stellar matter. We discuss theinfluence of the vector interaction on the equation of state(EoS) and investigate the restoration of chiral brokensymmetry. In the interior of astrophysical compact objectssuch as a neutron star, the density of matter can be severaltimes the nuclear matter saturation density. Calculationsbased on microscopic equations of state, which includeonly nucleons as degrees of freedom, show that the centraldensity of the most massive neutron stars is ∼ 7− 10 timesthe saturation density of nuclear matter. The precise pointwhere the transition from nuclear matter to the quarkmatter occurs, is not known and only estimates have beenput forward in the literature. We can assume a first orderphase transition, as suggested by lattice calculations, anduse the mentioned Nambu-Jona-Lasinio model to describethe quark phase and estimate the phase transition withinthe compact object and obtain mass-radius relations forhybrid stars. We show that, increasing the vector couplingin this model (which makes the EoS stiffer), we obtainmore massive stars with larger radii for the same centralenergy density.

[24/04/12 - P019]Phase Transitions in Quark Matter under StrongMagnetic Fields, Andre Felipe Garcia, Gabriel

Neves Ferrari, Marcus Benghi Pinto, UFSC - SC- Brazil �A widely studied subject within the contextof strong interactions in high energy physics is that ofthe QCD phase diagram. After it had became clear thathadrons are composed by confined quarks and gluons itwas suggested that they might undergo a phase transi-tion at high temperature or density, becoming a decon-fined plasma, the so called “quark-gluon plasma”. Thistransition has significant experimental implications (someof them being tested in modern accelerators such as theLHC, RHIC, etc), not to mention the description of theearly stages of the universe and the matter inside neutronstars. In the recently years it has been argued that spec-tators in heavy ion collisions are responsible for creatinga strong magnetic field that could play an important rolein determining the critical end point of the first-order line


transition. In this work we use the SU(2) Nambu-Jona-Lasinio (NJL) model along with some well known quantumfield theory techniques to introduce temperature and den-sity (Matsubara formalism) in order to study the chiraltransition in quark matter subject to a strong magnetic fi-eld. We will show some results involving the breaking ofchiral symmetry and its restoration at finite temperatureand density comparing the effects caused by an externalhomogeneous magnetic field.

[24/04/12 - P020]The Symmetry energy of nuclear matter un-der a strong magnetic field., Rudiney Casali,

Debora Menezes, UFSC - SC - Brazil, Constanca

Providencia, Universidade de Coimbra - Portugal�Asymmetric nuclear matter is an important issue for boththeoretical and experimental studies, specially for thoseinterested in the description of stellar matter of compactstars. With the advent of new radioactive beams whichwill be operating in the near future, this area appears pro-mising.The symmetry energy is a quantity related to the neutron-proton asymmetry in the equation of state of nuclear mat-ter, it is an important subject both for nuclear physics andastrophysics and is extremely important to the understan-ding of neutron star structure and composition [? ]. Inparticular, the symmetry energy slope defines nuclear mat-ter properties, such as, neutron skin, neutron dripline, bin-ding energy and core-crust transition density [? ]. We wantto study the effect of the magnetic field on the symmetryenergy.We consider a system formed by protons and neutrons, inte-racting via the exchange of σ-ω-ρ mesons, in the presenceof an uniform magnetic field B along the z-axis. Threepossible values of magnetic fields, B = 0, 1017 and 1018Gare taken. We will also study the effect of the anomalousmagnetic moment for protons and neutrons. The NL3 andFSU parameterizations are used to describe the equationsof state in the relativistic nuclear mean field formalism.These models present very different density dependence ofthe symmetry energy. At saturation, the slope L is, respec-tively, 118 and 60 MeV .

[24/04/12 - P021]The neutrino escape and gravitational wave gene-ration in protoneutron star cooling, Hilario A. R.

Goncalves, , Centro Federal de Educacao Tecnologica-CEFET/RJ, Anna M. Endler, Sergio B. Duarte,

Centro Brasileiro de Pesquisas Fısicas - CBPF, Marcello

Chiapparini, Universidade Estadual do Rio de Janeiro -UERJ �Protoneutron stars are formed as a fast and denserotating system with a period varying from seconds to fewmilliseconds. The core of these objects reaches extremelyhigh densities (around few times normal nuclear density)which allows to trap the neutrinos originated by electroncapture processes occurring in their interior during previ-ous gravitational collapse. A dense hadronic gas equation ofstate coupled with a leptonic sector by the beta-equilibrium(also considering trapped neutrinos in the medium) is usedto establish the initial configuration of the formed proto-neutron star. This configuration is perturbed by the escapeof these neutrinos a few seconds after its formation. The

system then contracts changing its angular momentum andshape. In this work, we present a simplified descriptionof the dynamical evolution of such system, solving nume-rically the equations of motion derived from an effectiveLagrangian. This description incorporates a kinetic termcompatible with the velocity field of the deformed rotatinghomogeneous system and the neutrino escape process. Thegeneration of gravitational waves is treated within the weakfield approximation, and the power of radiated gravitatio-nal energy, the angular momentum loss and changes in thedeformed shape are determined for different rates of neu-trino escape.

[24/04/12 - P022]Hyperon-meson and delta-meson coupling toproto-neutron stars structure, Wellington Alen-

car de Souto, , Jose Carlos Teixeira de Oliveira,

Universidade Federal de Roraima-UFRR, Hilario Ro-

drigues, Centro Federal de Educacao Tecnologica doRio de Janeiro-CEFET/RJ, Sergio Barbosa Duarte,

Centro Brasileiro de Pesquisas Fısicas-CBPF/RJ, Mar-

celo Chiapparini, Universidade do Estado do Rio deJaneiro - UERJ �In the present work we obtainedthe equation of state to be used to study the structureof neutron and proto-neutron stars. To this end, weadopted the non-linear Walecka model in the mean fieldapproximation [1,2], including the octet of baryons ofspin 1/2 (n, p,Λ0,Σ−,Σ0,Σ+,Ξ−,Ξ0) and the baryonicresonances of spin 3/2, represented by the delta matter(Δ−,Δ0,Δ+,Δ++) and by Ω−, in the baryonic sector[3.4]. In the leptonic sector we consider the electrons,the muons and the trapped neutrinos. We discuss thestructure of the proto-neutron stars including the deltaresonances in their composition, and compared the resultsof a cooled neutron star, after escape of neutrinos. Forproto-neutron star structure and composition the neu-trinos are considered trapped. The coupling constantsof the hyperons (Λ,Σ,Ξ) with the ω and ρ mesons arefixed by using SU(6) symmetry [5], and the hyperons-σcoupling constants are constrained by the consistenceof the hypernuclear potential in nuclear matter withhypernuclear data [5]. In addition, we use the finitedensity QCD sum rule to determine the possible values ofdelta-meson coupling constants [6]. From the equation ofstate obtained with this model we solve numerically theequation TOV (Tolman-Oppenheimer-Volkoff) [7,8] and sowe obtained the values of the maximum mass, before andafter the cooling phase.

References[1] J. D. Walecka, Ann. Phys. 83, 497 (1974).[2] B. D. Serot and J. D. Walecka, Adv. Nucl. Phys. 16, 1(1986).[3] J. C. T. Oliveira, M. Kyotoku, M. Chiapparini, H. Ro-drigues and S. B. Duarte, Mod. Phys. Lett. A 15, 1529(2000).[4] J. C. T. Oliveira, S. B. Duarte, H. Rodrigues, M. Chi-apparini and M. Kyotoku, Int. J. Mod. Phys. D 16, 175(2007).[5] M. Chiapparini et al., Nucl. Phys. A 826, 178 (2009).[6] D. S. Kosov, C. Fuchs, B. V. Martemyanov and A. Fa-


essler, Phys. Lett. B 421, 37 (1998).[7] R. C. Tolman, Phys. Rev. 55, 364 (1939).[8] J. R. Oppenheimer and G. M. Volkoff, Phys. Rev. 55,374 (1939).

[24/04/12 - P023]A mean field theory for the cold quark gluon plasmaapplied to stellar structure., D. A. Fogaca, F. S.

Navarra, B. Franzon, Intituto de Fısica, Universidadede Sao Paulo �The hot and strongly interacting quarkgluon plasma (QGP) has been observed in heavy ion col-lisions at RHIC. Quarks and gluons in a deconfined phasemight also exist in the core of compact stars. We shall as-sume here that the cold QGP is also a strongly interactingsystem. The strong interactions may be partly due to non-perturbative effects, which survive after the deconfinementtransition and which can be related with the non-vanishinggluon condensates in the QGP. From the QCD Lagrangianwe perform a gluon field decomposition in low (“soft”) andhigh (“hard”) momentum components. A mean field ap-proximation for the hard gluons is performed and the softgluons fields are associated to the condensates of dimensiontwo and four which provides a dynamical gluon mass anda bag constant for QCD, respectively.We derive an analytical expression for the equation of statein this approach, where the effect of the condensates is tosoften the equation of state and the hard gluons signifi-cantly increase the energy density and the pressure. Ourequation of state when compared to the MIT bag modelone, reaches higher values of the pressure at similar baryondensities.We study the effects of the hard gluons, the dynamicalgluon mass and bag constant in compact stars by applyingour equation of state in stellar structure calculations.

[24/04/12 - P024]Cold quark matter in compact stars,Bruno Cezar de Souza Franzon, Fernando Sil-

veira Navarra, David Fogaca, Universidade de SaoPaulo - SP - Brazil �In spite of the rapid progress inthe field, the region of the QCD phase diagram withlow temperature and high chemical potential is still notwell understood. The quark gluon plasma (QGP) atzero temperature and high baryon number is a systemthat may exist in the core of dense stars. It is quitepossible that this cold QGP shares some features with thehot QGP observed in heavy ion collisions, being also astrongly interacting system. In a previous work we havederived from the QCD Lagrangian an equation of state(EOS) for the cold QGP, which can be considered animproved version of the MIT bag model one. Comparedto the latter, our equation of state reaches higher valuesof the pressure at similar baryon densities. This is due toperturbative corrections and to non-perturbative effects.We also investigated the effect of the strange quark masson the equation of state and how it effected both the massand radius of compact stars. Here we apply this EOSto the study of neutron stars, discussing the stability ofquark matter and computing the mass-radius diagram.Our maximal masses are close to two solar masses, inagreement with the recently measured values of the massof the pulsar PSR J1614-2230.

[24/04/12 - P025]Neutron stars matter and the symmetry energy,Rafael Cavagnoli, Debora Peres Menezes, Univer-sidade Federal de Santa Catarina - UFSC, Constanca

Providencia, Universidade de Coimbra - UC �The ac-curate description of hadronic matter equations of state(EOS) is one of the main goals of nuclear physics. Thelimits of nuclear existence, the dynamics of heavy-ion col-lisions, the structure of neutron stars, and the collapse ofmassive stellar cores all depend sensitively on the equa-tion of state. Nuclear effective interactions provide a com-pact and efficient description of both the structure of finitenuclei and the equations of state of nuclear matter. Wecompute the equation of state of neutron star matter andthe resulting Mass-Radius relation (TOV equations) usingaccurately-calibrated relativistic mean-field models. Thesemodels have been calibrated to the properties of infinitenuclear matter at saturation density, to the ground-stateproperties of finite nuclei, or to both. One of them predictsa significantly soft symmetry energy, a feature that appearsconsistent with the behavior of dilute neutron matter. Theyalso include hard and soft equations of state with hard andsoft symmetry energies at intermediate and high densities.By using a new feature - the ω − ρ vector-isovector mesoninteraction, in different relativistic mean-field models, weinvestigate its effect on the neutron stars equation of state,the symmetry energy at high densities, hyperon creation,the Urca process and so on.

[24/04/12 - P026]Revisiting Pulsars and Magnetars,Luiz Laercio Lopes, Debora Peres Menezes,

Universidade Federal de Santa Catarina, SC - Brasil�Neutron stars are compact objects maintained by theequilibrium of gravity and the degenerescence pressure ofthe fermions together with a strong nuclear repulsion forcedue to the high density reached in their interior. Sincewe do not know yet the precise and detailed structureand composition of the inner core of a neutron star, manymodels have been used to describe it. In the present workwe study a hadronic neutron star constituted by nucleonsand hyperons and subject to a strong magnetic field withina relativistic model, called non-linear Walecka Model(NLWM). The presence of hyperons is justifiable sincethe constituents of neutron stars are fermions. On theother hand, some strange objects like the soft gamma-rayrepeaters and anomalous X-ray pulsars can be explainedassuming that these objects are neutron stars subject to astrong magnetic fields on their surface. These objects arecalled magnetars. To study the influence of the magneticfield in the stellar interior, we consider altogether foursolutions: two different values for the magnetic field toobtain a weak and a strong influence, and two configura-tions: a family of neutron stars formed only by protons,electrons and neutrons and another family formed byprotons, electrons, neutrons, muons and hyperons. In bothcases all the particles that constitutes the neutron star arein β equilibrium and the total net charge is zero. We willsee that although a magnetar can reaches 2.50M�, arisesa natural explanation of why we do not know pulsars withmasses above 2.0M�.


[24/04/12 - P027]HYPERON POPULATION IN HYBRID STARS,Rosana de Oliveira Gomes, Alberto Sperotto dos

Santos Rocha, Cesar Augusto Zen Vasconcellos,

UFRGS - RS - Brazil �Following the motivation of the re-cently observed pulsar of approximately 2M�, new studiesconcerning the equation of state (EoS) of neutron stars arebeing explored. In particular, several studies in literatureare searching for a mechanism that could explain the hype-ron population supression in neutron stars mainly becausesuch supression would lead to stiffer EoS and, consequently,to a higher star mass. In this work, we propose that hadron-quark phase transitions in the interior of neutron stars canbe such a mechanism, leading to hybrid stars in which thehyperon population is supressed for different choices of mo-dels’ parameters that are used to describe both phases. Weconsider a multicomponent system, composed by hadronicphase and deconfined quark phase, at zero temperature,and impose a first-order phase transition with two conser-ved charges (global baryonic number and electric charge)following the Gibbs criteria. The hadronic phase is descri-bed by non-linear Walecka model and the quark phase by abag model. Taking also different hyperonic coupling sche-mes and carrying out an analysis of the influence of uncer-tainties in nuclear matter properties at saturation, we solvethe Tolman-Oppenheimer-Volkoff (TOV) equations for thissystem and study their influence on mass-radius relationand population of hybrid stars.

[24/04/12 - P028]Neutrino mean-free-path in dense homogeneous nu-clear matter, Ubiratan Jose Furtado, Jose Ri-

cardo Marinelli, Department of Physics - CFM - UFSC�The behavior and properties of neutrinos in dense nu-clear matter is studied. Relativistic mean field models havebecome an standard approach to describe nuclear matterat different density regimes. The model Lagrangian den-sity where nucleons interact through the exchange of sca-lar, vector and isovector mesons has been widely used forthat purpose. The nuclear matter itself is described by thenon-linear Walecka model, solved in the mean-field appro-ximation. Besides the nucleons, mesons and leptons, theweak neutral boson and the weak charged bosons are in-cluded in the model and the energy density, pressure andparticle fractions are calculated. In particular, we wantto investigate the effect of the weak force on the neutrinodistribution in that system. We also obtain the total cross-section and mean-free path for the neutrinos, taking intoaccount scattering and neutrino absorption. We show thatthe inclusion of the weak force do not modify the hadronicdistribution, as expected, but it’s essential to the descrip-tion of the neutrino mean free path. We compare the finalresults for two know kinds of model parametrizations: onein which non-linear effects in the strong sector are explicitlywritten in the model Lagrangian and another one in whichthe coupling constants are density dependent. The solu-tion for this problem is interesting for the understandingof neutrino diffusion in a newly born neutron star after asupernova explosion.

[24/04/12 - P029]Study of the influence of a strong magnetic field on

the composition of nuclear matter at high densitiesand zero temperature., Eduardo Lenho Coelho,

Marcelo Chiapparini, UERJ - RJ - Brazil �Magnetarsare neutron stars with a strong surface magnetic field. Ob-servations of soft gamma-ray and anomalous X-ray pulsarspointed out that the surface magnetic field of magnetarsis ≥ 1015 G. The matter in the inner crust of magnetars,at densities between ∼ 4 × 1011 and ∼ 1014 g cm−3, isformed by a free superfluid neutrons, atomic nucleons anda uniform electron gas. This is the“neutron drip”regime.Because this, it’s a question of great interest to study thebehavior of nuclear and atomic matter in the presence of astrong magnetic field. In this work we study the influenceof a strong magnetic field on the composition of nuclearmatter at high densities and zero temperature. We des-cribe the matter through a relativistic mean-field model.The system of coupled nonlinear equations that describethe matter was solved numerically by iteration. We usethe Newton-Raphson method with global convergence. Asoutput of the numerical calculations, we obtain the relativepopulation of each species of particles as function of baryondensity and the energy density as function of baryon den-sity. The aim besides this work is to help in the unders-tanding of composition and dynamics of the inner core ofmagnetars.

Talks (17h30 - 19h30)

Talks - Session 04

[24/04/12 - 17h30 - Local: Salao Chardonnay]Search of CP violation in B charmless three bodydecays, Ignacio Bediaga, CBPF, RJ �Decays of Bmesons to three-body charmless hadronic final states mayprovide new possibilities for CP violation searches. In con-trast to decays to two-body final states where direct CPviolation can only manifest itself as difference in decay ra-tes for B and B mesons to charge conjugate final states, inthree-body decays it can also be observed as a differencein relative phases between two quasi-two-body channels.A necessary condition for observing direct CP violation ina two-body decay is a non-trivial strong phase differencebetween the CP-conserving and CP-violating amplitudescontributing to a particular final state. Although this con-dition (if satisfied) also enhances the sensitivity to CP vi-olation in three-body decays, it is not required in generaland direct CP violation in quasi-two-body decays can alsobe observed with any strong phase difference via the in-terference with a nearby quasi-two-body or non-resonantamplitude(s). Thus, three body B decays have been an im-portant tool to search different sources of CP violation co-ming or not from Standard Model. However there are someexperimental problems, related to the amplitude analysis.Alternatively model independent approach to search, in ashort time scale, possible sources of CP asymmetries is pre-sent. It is also present some proposal to try to get moreinformations from data, in order to develop a realistic am-plitude analysis, taking in account the experience accumu-lated with the Isobar model from charm three body decaysand the possible adaptations to the big increase of the phase


space for the B decays.

[24/04/12 - 18h00 - Local: Salao Chardonnay]Charm and bottom hadronic form factors withQCD sum rule, Mirian Bracco, Faculdade de Tec-nologia, Universidade do Estado do Rio de Janeiro, RJ�We present a brief review of some calculations of formfactors and coupling constants in vertices with charm andbottom mesons in the framework of QCD sum rules. Wefirst discuss the motivation for this work, describing possi-ble applications of these form factors to heavy ion collisionsand to B decays. We then present an introduction to themethod of QCD sum rules and describe how to work withthe three-point function. We give special attention to theprocedure employed to extrapolate results of the QCDSR toobtain the coupling constant. We discuss the uncertaintiesin our results. Finally we compare the coupling constantswith estimates obtained with other methods.Bibliography:[1] M.A. Shifman, A.I. Vainshtein and V.I. Zakharov, Nucl.Phys. B 147 (1979) 385.[2] M.E. Bracco, M. Chiapparini, F.S. Navarra, M. Nielsen,[arXiv:1104.2864][3] M.E. Bracco, M. Nielsen, Phys. Rev. D 82 (2012)034012.[4] B. Osorio Rodrigues, M.E. Bracco, M. Nielsen, F.S. Na-varra, Nucl. Phys. A 852 (2011) 127.[5] B. Osorio Rodrigues, M.E. Braccco and M. Chiapparini,AIP Conf. Proc. 1296 (2010) 302.[6] A. Cerqueira, Jr., M.E. Bracco, AIP Conf. Proc. 1296(2010) 298.[7] A. Cerqueira, Jr., B. Osorio Rodrigues, M.E. Bracco,Nucl. Phys. A 874 ( 2012) 130.

[24/04/12 - 18h30 - Local: Salao Chardonnay]Deconfinement and chiral symmetry res-toration in nonlocal chiral quark models,Daniel Gomez Dumm, UNLP, La Plata, Argentina�The description of strong interactions in the nonper-turbative regime is still one of the most important openproblems in particle physics. In particular, the detailedknowledge of the phase diagram for strongly interactingmatter has become an issue of great interest in recentyears, in view of the development of the experimen-tal programs with ultrarelativistic heavy ion beams atCERN-SPS and BNL-RHIC and the applications of thissubject to cosmology and astrophysics. On the theoreticalside, even if a significant progress has been made on thedevelopment of ab initio calculations such as lattice QCD,these are not yet able to provide a full understanding ofthe QCD phase diagram due to the well-known difficultiesof dealing with finite chemical potentials. Therefore,it is important to develop effective models that showconsistency with lattice results and can be extrapolatedinto regions not accessible by lattice calculation techni-ques. One of the most popular approaches to an effectivedescription of the QCD interactions is the quark versionof the Nambu¡Jona-Lasinio (NJL) model, in which quarkfields interact through local four point vertices that satisfychiral symmetry constraints. We study the QCD phasediagram in the context of a nonlocal effective chiral quarkmodel, in which quarks are coupled to a background color

field. This approach, which can be seen as a nonlocalextension of the so-called Polyakov Nambu-Jona-Lasiniomodel, provides a common framework to study both chiraland deconfinement transitions. The predictions of ourmodel can be compared with those obtained in latticeQCD. We consider the cases of both real and imaginarychemical potentials, analyzing the characteristics of thephase transitions and the position of critical points.

[24/04/12 - 19h00 - Local: Salao Chardonnay]Current quark mass dependence of the QCDphase diagram within non-local quark models,V. P. Pagura, N. N. Scoccola, CNEA - Argentina, D.

Gomez Dumm, UNLP - Argentina �The detailed unders-tanding of the behaviour of strongly interacting matter atfinite temperature and baryon density represents an issueof great interest in particle physics. Even though latticeQCD calculations have been significantly improved in thelast years this ab initio approach is not yet able to providea full understanding of the QCD phase diagram. Thus, it isworth to develop alternative approaches, such as the studyof effective models one of which is the so called non-localPolyakov-Nambu-Jona-Lasinio (nlPNJL) model, and it isimportant to consider situations in which the results ob-tained within effective models can be compared with anyavailable lattice QCD results. We study the effects of ex-plicit chiral symmetry breaking due to the current quarkmass on the strongly interacting matter phase diagramin the context of non-local Polyakov-Nambu-Jona–Lasiniomodels. We analyze the mass dependence of the criticaltemperature at vanishing chemical potential as obtainedin the present model and compare it with that obtainedin alternative models and existing lattice calculations. Wealso analyze the mass dependence of the phase diagram ofstrongly interacting matter for real and imaginary chemicalpotential. Special attention is paid to the mass dependenceof the critical end points.



Lecture: Typel II



Lecture: Kovchegov III


















Lecture: Petreczky II




Lecture: Typel III


Talks (15h - 17h)

Talks - Session 05

[26/04/12 - 15h00 - Local: Salao Chardonnay]Results from ALICE, Mateusz Andrzej Ploskon,

Lawrence Berkeley National Laboratory, Berkeley, USA�The ALICE experiment at CERN is dedicated for heavy-ion collisions at the LHC. Heavy-ion collisions at high ener-gies create strongly interacting, hot and dense plasma ofquarks and gluons (QGP). Quark-gluon plasma is a state ofmatter in which the elementary particles that make up thehadrons of baryonic matter are freed of their strong attrac-tion for one another under extremely high energy densities.These particles are the quarks and gluons that composebaryonic matter. In normal matter quarks are confined; inthe QGP quarks are deconfined. In classical QCD quarksare the fermionic components of mesons and baryons whilethe gluons are considered the Bosonic components of suchparticles. The gluons are the force carriers, or bosons, of theQCD color force, while the quarks by themselves are theirfermionic matter counterparts. Although the experimental

high temperatures and densities predicted as producing aquark-gluon plasma have been realized in the laboratory,the resulting matter does not behave as a quasi-ideal stateof free quarks and gluons, but, rather, as an almost perfectdense fluid. The QGP can be created by heating matter upto a temperature of 2×1012 K, which amounts to 175 MeVper particle. This can be accomplished by colliding twolarge nuclei at high energy. Lead and gold nuclei have beenused for such collisions at LHC and BNL RHIC, respecti-vely. The nuclei are accelerated to ultrarelativistic speedsand slammed into each other. Due to the relativistic spe-eds they are Lorentz contracted. Each nucleus has a smallprobability of a sufficiently head-on hit for a QGP, manynuclei just graze, but the numbers that do collide is suf-ficient for experiment, and in the case of a storage ring,those that miss are often recycled. When they do collide,the resulting hot volume called a ”fireball”is created after ahead-on collision. Once created, this fireball is expected toexpand under its own pressure, and cool while expanding.In this talk we present an overview of the recent measure-ments from Pb-Pb collisions at

√s = 2.76 TeV addressing

some of the most interesting properties of QGP, such as itsdensity, temperature and hydrodynamic attributes.

[26/04/12 - 15h30 - Local: Salao Chardonnay]The PANDA-experiment at the future FAIR-accelerator, Frank E. Maas, Institute for NuclearPhysics - Johannes Gutenberg-Universitat Mainz , Ger-many �In this talk we summarize the current status ofPANDA project. The PANDA experiment will be one ofthe key experiments at the Facility for Antiproton and IonResearch (FAIR) which is under construction and curren-tly being built on the area of the GSI Helmholtzzentrumfur Schwerionenforschung in Darmstadt, Germany. Thecentral part of FAIR is a synchrotron complex providingintense pulsed ion beams (from p to U). Antiprotons pro-duced by a primary proton beam will then be filled intothe High Energy Storage Ring (HESR) which collide withthe fixed target inside the PANDA Detector. The PANDACollaboration with more than 450 scientist from 17 coun-tries intends to do basic research on various topics aroundthe weak and strong forces, exotic states of matter andthe structure of hadrons. In order to gather all the ne-cessary information from the antiproton-proton collisions aversatile detector will be build being able to provide precisetrajectory reconstruction, energy and momentum measure-ments and very efficient identification of charged particles.Concerning the physics program of PANDA various topicsare going to be investigated like search for exotic particlesand measurement of hadron properties, study in-mediumeffects of hadronic particles, generalized parton distribu-tion, Drell-Yan processes and time-like form factor of theproton and measurement of nuclear properties with an ad-ditional strangeness degree of freedom.

[26/04/12 - 16h00 - Local: Salao Chardonnay]Baryon Spectroscopy at Jefferson Lab in the 6 GeVEra: What have we learned about excited nucleonstates?, Volker Crede, University of Florida, USA�Nucleons are complex systems of confined quarks and glu-ons and exhibit the characteristic spectra of excited states.In particular, highly-excited states are sensitive to the de-


tails of quark confinement, which is only poorly unders-tood within quantum chromodynamics (QCD). This is theregime of non-perturbative QCD and it is one of the keyissues in hadronic physics to identify the corresponding re-levant degrees of freedom and the effective forces betweenthem. In recent years, lattice-QCD has made significantprogress toward understanding the spectra of hadrons. Onthe experimental side, high-energy electrons and photonsare a remarkably clean probe of hadronic matter, provi-ding a microscope for examining the strong nuclear force.For more than a decade, laboratories worldwide have accu-mulated data for such investigations, resulting in a numberof surprising discoveries and contributing to our understan-ding of the nucleon, its underlying quark structure, and thedynamics of the strong interaction. Current experimentalefforts utilize highly-polarized frozen-spin (butanol) targetsand deuterium targets in combination with polarized pho-ton beams. These are important steps toward so-calledcomplete experiments that will allow us to unambiguouslydetermine the scattering amplitudes in the underlying reac-tions and to identify resonance contributions. In my talk,I will give an overview of the excited baryon program atJefferson Lab and I will discuss recent results from the(double-)polarization FROST experiments.

[26/04/12 - 16h30 - Local: Salao Chardonnay]Quarkonia production in 2.76 TeV PbPb collisi-ons in CMS, Varese Salvador Timoteo, Faculdadede Tecnologia, Universidade Estadual de Campinas, SP�The nucleon-nucleon (NN) interaction in leading ordercorresponds to the one-pion-exchange potential (OPEP)plus a Dirac delta, when considering an effective field the-ory (EFT) of nuclear forces based on a chiral expansion ofthe effective Lagrangian. This procedure was suggested byWeinberg, with a recipe to infer the values of the strengthof the Dirac-delta interaction in the 1S0 and 3S1 channelsfrom the singlet and triplet scattering lengths respectively.Therefore, the singlet and triplet scattering lengths allowsto the renormalized strengths of the contact interactions.This effective potential should be valid for momenta wellbelow some typical momentum scale considered in quan-tum chromodynamics (QCD), such as the rho meson mass,which implies in a cutoff at the momentum scale of thisorder or below, for the intermediate virtual propagation ofthe NN system. About a decade ago, an alternative wayto renormalize the nucleon-nucleon interaction, for a sin-gular potential was proposed. In an extension of that, theapproach was proved to be RG invariant, as it satisfies the corresponding non-relativistic Callan-Symanzikequations. In this approach, no cutoff is considered in theequations and/or interactions. Instead, it is introduced asubtraction point in the kernel of the Lippmann-Schwinger(LS) equation, in order to reach afinite T matrix. I this talk, we review some techniques forthe renormalization of the nucleon-nucleon interaction byusing the leading order NN interaction in the 1S0 chan-nel as an example. We discuss the cutoff regularization,the renormalization with subtractions and the similarityrenormalization group evolution of the one-pion exchangeinteraction plus a contact term. Analytical and numericalresults will be presented and discussed.

Talks - Session 06

[26/04/12 - 15h00 - Local: Salao Chardonnay]Latest results from the Pierre Auger Observatory,Vitor de Souza Filho, Instituto de Fisica de Sao Car-los, USP �Recent results obtained with the Pierre AugerObservatory are described. The Pierre Auger Observatoryis a hybrid detector located in Malargue, Mendoza, Argen-tina. It consists of an array of particle detectors and a setof fluorescence telescopes at four sites that provide a uniquecross calibration capability. The SD is spread over a sur-face of 3000 km2 at an altitude of 1400 m above sea level.The recent results from AUGER include measurements ofthe spectrum, anisotropies and composition of ultra-highenergy cosmic rays. The ankle of the spectrum is measu-red at 4 × 1018 eV and a suppression above 3 × 1019 eVconsistent with the GZK effect is observed. At energiesabove 5.5 × 1019 eV a correlation with the distribution ofnearby extragalactic objects is found, including an excessaround the direction of Centaurus A, the nearest radio loudactive galaxy. Measurements of the depth of shower maxi-mum and its fluctuations suggest a gradual change in theaverage mass of the primary cosmic rays (under standardextrapolations of hadronic interaction models), being theresults consistent with a light composition consisting mos-tly of protons at few×1018 eV and approaching the expec-tations from iron nuclei at 4×1019 eV. Upper bounds on thephoton fraction and the neutrino fluxes are also obtained.

[26/04/12 - 15h30 - Local: Salao Chardonnay]Molecular Aspect of Charm Physics,F. Fernandez, P. G. Ortega and D. R. En-

tem, Grupo de Fısica Nuclear and IUFFyM, Universidadde Salamanca, E-37008 Salamanca, Spain �In differentcharmonium sectors several resonances like the X(3872),X(3915), G(3900), etc, has been reported in the last timewithout a clear theoretical interpretation in terms of ccpairs. Even in the baryon spectrum, resonances like theΛ+c (2940) are a challenge for theoretical models. In this

work we propose a theortical explanation for this kind ofphenomena as molecular structures coupled or not to ccstates. We work in the framework of a coupled channelcalculation following Ref. [1] generalized to include severalmeson-antimeson channels, several qq states below andresonances above threshold. The T -matrix is decomposedin a non-resonant and a resonant contribution. We lookfor poles of the T -matrix in the second Riemann sheetlooking for zeros of the dressed propagator. Then wesolve an eigenvalue problem to obtained the cc amplitudesand with them and the dressed vertex we obtained themeson-antimeson wave functions. Finally we define thepartial widths evaluating the residues of the pole.The qq states are found solving the Schrodinger equation inthe framework of the constituent quark model of Ref. [2].This model includes pion exchanges between quarks whichis very importante to describe the DD and Dp interactionThe meson-antimeson interaction is consistently obtainedusing the Resonating Group Method with these wave func-tions and interaction. Finally we couple the qq states withthe qqqq states using the microscopic 3P0 model.In this calculation the well known X(3872) resonance appe-


ars as a DD∗ molecule coupled to a χc1(2P ) cc state. Theoriginal χc1(2P ) acquires a significantDD

∗ component andcan be identified with the X(3940). In the 0++ sector weinclude in the calculation the χc0(2P ) cc state and the DD,J/ψω, DsDs and J/ψφ meson-antimeson states. We findtwo states which can be identified with the X(3915) and

with the sometimes called Y (3940). In the 1−− sector weobtain two new molecular states that could be assigned tothe G(3940) and the controversial Y (4008) with an impor-tant dressing of the well established ψ(4040) and ψ(4160).Physical consequences of this dressing are discussed. Fi-nally the Λ+

c (2940) is well described as a pD molecule.

[1] V. Baru et al., Eur. Phys. J. A 44, 93 (2010). Phys. Rev. D79, 092001 (2009).

[2] J. Vijande, F. Fernandez, and A. Valcarce, J. Phys. G 31,481 (2005).

[26/04/12 - 16h00 - Local: Salao Chardonnay]Linear sigma model with vector mesons,Gyorgy Wolf, Peter Kovacs, MTA Wigner FK,Budapest, Hungary, Denis Parganlija, Francesco Gi-

acosa, Dirk Rischke, University of Frankfurt, Germany�Effective field theories play a very important role in theinvestigation of the strong interaction, since in the funda-mental theory (QCD) lots of questions cannot be answereddirectly due to the complexity of the model. However,in effective field theories, which possess the same globalsymmetries (chiral symmetry) as QCD, the meson/hadronspectrum can be investigated thoroughly. A three flavorlinear sigma model with vector and axial-vector mesonsis discussed. We derive the masses and the decay widthsof the mesons. We fit the parameters of the model tothe experimentally measured quantities, like the mesonmasses, widths and the decay constant of π and K. Sincein the relevant energy region there are two A0’s, K0’s andfive f0’s it is not straightforward which scalar mesons canbe consider as the chiral partners of the pseudo scalaroctet. We tried all combinations, and we can conclude thatthe mass of the scalar quarkonia is all above 1 GeV. Ourmodel cannot select out the two f0’s out of the three above1 GeV. To that one needs the inclusion of the glueball intothe model (not yet done), since these states are probablythe mixture of the two quarkonia and the glueball.


Posters - Session C

[26/04/12 - P001]Hamilton-Jacobi Formalism to Podolsky Electro-magnetic Theory on the Null-Plane, M.C. Bertin,

, CMCC - Universidade Federal do ABC - Brazil, B. M.

Pimentel, Instituto de Fısica Teorica - UNESP - Brazil,G. E. R. Zambrano, Departamento de Fısica - Universi-dad de Narino - Colombia �The Podolsky electromagnetictheory is a higher-order derivative field theory, it is a gene-ralization of the Maxwell field and it was suggested to avoiddivergences such as the electron-self energy and the vacuumpolarization current. Podolskys theory solved the problemof infinite energy in the electrostatic case and also givesthe correct expression for the self-force of charged particlesat short distances. It has been shown that the Lagran-gian density which describe the theory is the only possible

generalization of the electromagnetic field that preservesinvariance under U(1).The Hamiltonian dynamics of the theory was studied on thenull-plane coordinates. Since this theory is constrained, aconsistent approach using the Dirac Hamiltonian methodwas applied to calculate the complete set constraints.Theconstraint structure presented a set of second-class cons-traints, which are exclusive of the analysis on the null-plane,and an expected set of first-class ones. An inspection onthe field equations leads to the generalized radiation gaugeon the null-plane. Dirac Brackets were introduced by con-sidering the problem of uniqueness under the chosen initial-boundary conditions of the theory.In this work we will develop the Hamilton - Jacobi forma-lism to study the Podolsky electromagnetic theory on thenull-plane coordinates. We are going to calculate the ge-nerators of the Podolsky theory and check the integrabilityconditions. Appropriated boundary conditions will be in-troduced to guarantee the Green functions associated tothe differential operators and eliminate the non-involutiveconstraints in the Hamilton - Jacobi formalism by construc-ting the generalized brackets.

[26/04/12 - P002]Divergences of Generalized Quantum Electrodyna-mics on the Lorentz Gauge., R. Bufalo, , B. P.

Pimentel, Instituto de Fısica Teorica - UNESP - Brazil,G. E. R. Zambrano, Departamento de Fısica - Univer-sidad de Narino - Colombia �The higher-order derivativetheories are a very interesting branch within of the effectivetheories; once the use of higher derivative terms becomes apowerful regulator scheme, by the fact that they improvethe convergence of the Feynman diagrams. As a remark,these additional terms are indeed constructed in such a wayso as to preserve the original symmetries of the problem.one of the theories that most contributed to show the effec-tiveness of such terms in field theory were the contributionsof Bopp and Podolsky and Schwed; where they proposed ageneralization of the Maxwell Electromagnetic field. Theywanted to get rid of the inherent pathologies of the theorysuch as the point charge self-energy (r-1 singularity) andthe vacuum polarization current present in the Maxwelliantheory.This main idea and some other purposes led Podolsky tostudy the interaction of electrons with the Podolsky pho-ton; a theory which they named as: Generalized QuantumElectrodynamics (GQED). Among the points dealt with insuch works, the most interesting was the calculation of theelectron self-energy at a one-loop approximation. They ex-pected that the contribution of the massive photons wouldlead to a finite result; but, in the end, they found, as in the


usual QED, a divergent expression. nevertheless, it wasshowed that the choice of an appropriate gauge conditionyields finite terms of the radiative correction expressions:electron self-energy Σ and vertex part Λ, at order-α. Inthis work we are going to prove that whether the Lorenzgauge is used: the WFT identities are preserved, however,the divergences are still maintained.

[26/04/12 - P003]A nonextensive statistical model for the nucleonstructure function., Luis Augusto Trevisan, Uni-versidade Estadual de Ponta Grossa, C. Mirez, Rosan-

gela S. Bastos, Campus do Mucuri, Rua do Cruzeiro01, Jardim Sao Paulo, 39803-371, Teofilo Otoni, MinasGerais, Brazil �Recently, the nonextensive statistical me-chanics, proposed by Tsallis has been considered to explainsome features of nuclear collisions. The theoretical founda-tion of these works is the fact of the nonextensive statisticalmechanics can be considered as an appropriate basis to dealwith physical system with strong correlation dynamics sys-tems, long range interactions and memory effects .The quarks inside a nucleon have strong correlation dyna-mics and, according to some confining model used, longrange interactions. For this reason, we intend to show astudy about the features of a structure function of the nu-cleon based on the principles of the nonextensive thermody-namics. Since the usual thermodynamics is a special case ofthe nonextensive (if q = 1) the focus is to show the effectsof change the q values around q = 1.In this paper we have presented a statistical model to des-cribe the proton and neutron structure functions based onthe adaptation of Fermi-Dirac and Bode Einstein statis-tics to Tsallis distribution. The important variables arethe temperature T , the Tsallis variable q and the radio R.There is also three constraint equations to give the norma-lization of up and down quarks and the sum of momentsThe results show the values q < 1, on the opposite ofanother studies about high energy collisions between nu-clei, that show q > 1. These are different physical system.The resulting distribution was compared with experimen-tal measurements. Whether or not the Tsallis distributionprovides a valid interpretation of high energy collision datawill need further theoretical work.

[26/04/12 - P004]Advances os statistical/thermodynamcalmodel for unpolarized structure function,Luis Augusto Trevisan, Universidade Estadual dePonta Grossa, C. Mirez, Campus do Mucuri, Rua doCruzeiro 01, Jardim Sao Paulo, 39803-371, Teofilo Otoni,Minas Gerais, Brazil, Lauro Tomio, Instituto de FısicaTeorica-Unesp, Rosangela S. Bastos, Campus doMucuri, Rua do Cruzeiro 01, Jardim Sao Paulo, 39803-371, Teofilo Otoni, Minas Gerais, Brazil �The QCD(Quantum Chromo Dynamics) is the theory of the stronginteraction in the standard model. It is elaborated to des-cribes the short range interactions among the subnuclearcomponents, the quarks. These interactions are mediatedby the gluons, and the main difference with the QED(Quantum Electro Dynamics) is the use of a Lagrangianwhere gluons may interact among them ( on the oppositeof the photons form QED, that don’t interact).

Although this theory has been successful to describe manyimportant aspects, some open question have been studiedwith alternative effective models, respecting the basic prin-ciples of QCD . One of the open question concerning to thestructure function, i.e, the distribution of energy of quarksinside the nucleon. Some reasons to use the effective modelsare discussed in the following:The perturbative theories (short distances) allow to des-cribe the interactions inside the nucleon (strong interacti-ons between quarks and gluons). However, including morediagrams and trying to describe more details, this methodbecomes quite complex, with so many loopings, renormali-zations and almost impracticable.One should remark that in principle, this is already a 3-body problem, without no analytical solution even in clas-sical cases. On the other the lattice quantum field theoryalso demands great computational efforts.Some effective models do not include the Fermi-Dirac andBose-Einstein statistics as an important physical effect, forinstance the valon model, perturbative chiral , the parame-ters are fixed according to the experimental data available.In order to consider the thermodynamical features, duringthe eights and nineties many statistical/thermodynamicalmodels were proposed to describe the nucleon structurefunctions and distribution of the quarks in hadron. Mostof these models describe the compound quarks and gluonsinside the nucleon as a Fermi / Bose gas respectively, con-fined in a MIT bag with continuous energy level. Anothermodels considers discrete spectrum. All these models in-tend to describe the main features of the nucleons, suchas the quark sea asymmetry and the ratio between the theproton and neutron structure functions.In the present work, we make a review about hadronic mo-dels that use statistical/thermodynamical features to des-cribe the the hadrons unpolarized structure functions.

[26/04/12 - P005]Correspondence between the Self-Dual model andthe Topologically Massive Electrodynamics: A newview, B. M. Pimentel, , C. E. Valcarcel, Institutode Fısica Teorica , UNESP - Sao Paulo State University�Topologically Massive Gauge Theories were introduced inthe early eighties as a novel method to provide a infraredcut-off to purely kinetic 2+1 gauge theories. Some yearslater, Townsend introduced the Self-Dual model which isalso defined in odd dimensions. There is a correspondencebetween these Topologically Massive theories and the Self-Dual model. For example, the correspondent Self-Dual mo-del to the Topologically Massive Electrodynamics is givenby a Lagrangian density which consists in the massive partof a Proca field plus a Chern-Simons term. Therefore, itpresents a simpler structure due to the linearity in the cor-respondent velocity fields.This correspondence has been analysed with the Faddev-Jackiw formalism and with the Dirac’s method for singularsystems. This study had also provided the first steps tothe proper generalization to the non-abelian case, i.e., theself-dual model of the Topologically Massive Yang-Mills fi-eld, as well as the investigation of the self-duality of theTopologically Massive Gravity.In this work we analyse the constraint structure of the


Self-Dual model within the scope of the Hamilton-Jacobiformalism. We will also show that the algebraic structureof the generalized brackets, result of the presence of non-involutive Hamiltonians, allows us to find the correspon-dence with the Topologically Massive Electrodynamics.

[26/04/12 - P006]The proton structure in the region of high xB, Fer-

nando Navarra, , Samuel Sanches, USP - SP - Brazil�The hadron structure has been intensively studied overthe last 20 years, but mostly in regions of medium and lowBjorken x. On the other hand, there are large experimentalprojects (JLab 12 GeV and CERN COMPASS-II) that willproduce a lot of data on lepton-nucleon deep inelastic scat-tering in kinematics regions not study yet, like the regionwhere the parton carries a large momentum fraction of theparent nucleon. It is well know from literature that thehigh xB region is quite problematic, because, among otherthings, one needs to deal with the nucleon resonance region.To avoid this region, one should have an invariant mass forthe system greater than 2 GeV. One can do this by lowe-ring the value for xB (irrelevant for our current research),or by increasing the value of Q2. In the later case, thereare not many experimental data and the projects mentio-ned will try to fill this gap. When one is in the low Q2

region, an extra problem appears: corrections in the formofM2/Q2, usually disregarded in the OPE expansion, havenow to be taken care of. These corrections are referred toas Target Mass Corrections (TMC). Our work aims to findclean ways to separate these TMC from the experimentaldata and thus related them to the usual structure functi-ons, measured in other experiments, with are free of effectscoming from the finite value of the nucleon mass.

[26/04/12 - P007]Simultaneous particle emissions in hot nuclei eva-poration process, Leonardo P. G. De Assis,

, Sergio B. Duarte, Centro Brasileiro de PesquisasFısicas, Bianca Martins Santos, Instituto de Fısica,Universidade Federal Fluminense �This work presents anew mechanism for the evaporation stage in spallation pro-cess induced by high energy proton beam on a heavy targetnucleus. Spallation process is characterized by two distinctphases: the intranuclear cascade (rapid) and the nuclearevaporation (slow) stage. In both stages hadrons can beemitted with high energy in the cascade phase and withlow energy in the evaporation. Here, we focus attention onthe evaporation mechanism starting with the hot residualcascade compound nucleus. At this stage a chain of ha-drons are emitted in competitions with the nuclear fission.The evaporation chain ends when remain excitation energyis not sufficient to emit any other particle or fission processoccurs. We introduce the simultaneous particles emissionmechanism in the evaporation chain as new channels ope-ned to high excitation energy regime of the compound nu-cleus, which are an unexplored subject until present days.This evaporation reaction chain includes many nuclides farfrom the beta stability line, for which there are no experi-mental data available. Presently the nuclear properties ofthese nuclei are a subject of intense theoretical and expe-rimental physical research for the understanding of exoticnuclei structure. The probability of multiple simultane-

ous emissions is obtained using phase space approach. AMonte Carlo simulation is employed to compute the finalaverage yield of emitted particles after the decay chain. Theneutron, proton, alpha and fission yields are obtained andcompared to the conventional calculation with sequentialsimple particles emission. The relevance of the differentchannels in competition is also analyzed

[26/04/12 - P008]Heavy Quark Production in the Black Hole Eva-poration at LHC, V. P. Goncalves, , W. K. Sau-

ter, M. Thiel, UFPel - RS - Brazil �The understandingof Quantum Chromodynamics (QCD) and Quantum Gra-vity are currently two of the main open questions in Phy-sics. In order to understand these problems some authorsproposed the existence of extra dimensions in the Nature.These extra dimensions would be compacted and not vi-sible on the macroscopic world, but the effects would bemanifest in ultrarelativistic colision process. In particular,black holes (BH) could be produced in proton-proton co-lision process in the Large Hadron Collider (LHC) and infuture colliders. The BH is an object characterized by itsmass and temperature wich also characterizes the evapora-tion process. All kind of particle should be produced in thisprocess. Our goal in this contribution is to study the BHproduction in proton - proton collisions at LHC and Cos-mic Ray energies and its evaporation rate in heavy quarks.We present our estimate considering two scenarios (withand without inelasticity corrections) and compare our pre-dictions with those obtained using perturbative QCD. Ourresults demonstrate that in both scenarios the charm andbottom production in the BH evaporation are smaller thanthe QCD prediction at LHC and Cosmic Ray Energies. Incontrast, the top production is similar or larger than theQCD prediction, if the inelasticity corrections are disregar-ded.

[26/04/12 - P009]Photoproduction of lepton pairs in proton-nucleusand nucleus-nucleus collisions at RHIC and LHCenergies, Bruno Duarte da Silva Moreira, Victor

Paulo Barros Goncalves, Joao Thiago de San-

tana Amaral, Universidade Federal de Pelotas �Studiesof photon-proton and photon-nucleus interactions at theRHIC and LHC could provide valuable information on theQCD dynamics at the high energies. In this contributionwe demonstrate these coherent interactions can also be use-ful to study nonlinear effects in the Quantum Electrody-namics (QED). In particular, we study the multiphotoneffects in the production of lepton pairs for collisions ofhigh energy protons with heavy nuclei and ultrarelativisticheavy ion collisions. As each scattering contributes with afactor Z times the electromagnetic coupling constant to thecross section, this contribution must be taken into accountfor heavy nuclei. For proton-nucleus collisions, we assumethe ultrarelativistic proton as a source of photons and fornucleus-nucleus collisions we consider the two nuclei as asource of photons. In these two cases, we estimate the pho-toproduction of lepton pairs considering the multiphotoneffects associated to multiple rescattering of the projectilephoton on the proton of the nucleus, and calculate the totalcross section for electron, muon and tau pair production in


proton-nucleus and nucleus-nucleus collisions at RHIC andLHC energies. Moreover, we compare the Born predicti-ons with those obtained including the Coulomb correctionsand estimate the contribution of these corrections at highenergies and different leptons flavors.

[26/04/12 - P010]The final stage of gravitational collapse for highdensity fluid medium., Miguel Gustavo de Cam-

pos Batista, , Rochelle Gomes de Souza, PhysicsDepartament-Roraima Federal University �Constructinga relativistic Lagrangian that allows bare nucleons to inte-ract attractively via scalar meson exchange and repulsivelyby a more massive vector meson exchange, we can obtaina stiff matter state equation (P = ρ) to characterize thefluid at high density. This state equation can be used forfluid densities of order 1014g/cm3 . On the other hand,Hagedorn considered that, for large mass, the spectrum ofhadrons grows exponentially, namely ρ(m) ∼ exp(m/TH),where TH is the Hagedorn temperature, resulting the stateequation P = P0 + ρ0ln

ρρ0. For Hagedorn state equation

the sound speed tends to zero for ρρ0

→ ∞; in opposition to

the mean field theory, that leading to the stiff matter stateequation where cs → 1. In the literature, was discussed thecollapse of Hagerdon fluid. The fate of gravitational col-lapse can results a black hole, or a naked singularity, wherethe last case is consequence of the collapse of a compact ob-ject. The question is, what is the alteration of this pictureif we consider the collapse of compact fluid at high densitiesconsidering the coupling with vacuum energy? Therefore,we investigate the apparent horizon formation in a fluidwith high density in the presence of a vacuum component,and examine the influence of the vacuum energy at higherdensity fluid on the fate of the collapse process.

[26/04/12 - P011]QUANTUM THEORY OF BOSONSAND FERMIONS CONDENSATION,Adriano Nogueira de Souza, Victor Santos

Filho, Joao P. B. de Melo, LFTC- UniversidadeCruzeiro do Sul, SP, Brazil �Summary:In this paper, we describe the formalism of quantum fieldtheory applied to the study and description of the pheno-menon of condensation in bosonic systems and we compa-red with the case of condensation of fermionic systems.Thecondensed state is now considered by many researchers thefifth state of matter it contains very different properties.In this study, we emphasized initially the general proper-ties of such systems in the bosonic case, as the existenceof attractive or repulsive interaction of two bodies, depen-ding on the nature of the species of particles considered.The mathematical formulation of the field theory for manyparticles is described in the case in which the coupling pa-rameter of two bodies depends essentially on the scatteringlength.The phenomenon of condensation in the case of fermionsis discussed and then compared with the case of bosons.In the case of fermions, we know that Pauli’s exclusionprinciple prevents these particles occupy the same quantumstate, which is possible only if we consider them in pairs.Thus, a discussion of the possible condensation of hadronsis discussed, based on the experiments in which a magnetic

field is applied to a system of fermions, so they get boundtogether in pairs, as they occur in the case of Cooper’s pairsin superconductivity.

[26/04/12 - P012]The dimensional regularization in light front,L. A. Soriano, A. T. Suzuki, Instituto de FısicaTeorica-UNESP, J. H. O. Sales, Universidade Estadualde Santa Cruz-UESC �In 1949 Dirac proposed three dif-ferent dynamical forms for relativistic particles dependingon the type of hyper-surface chosen for the temporal evo-lution of the system[1]. The instant form dynamics is theusual one, consisting in specifying the initial data (initialposition and velocity) over the surface x0 = constant; thepoint form, whose surface is specified by the initial condi-tions at x.x = k2 and t > 0 with constant k, where data isgiven over a branch of a hyperboloid, and the third formula-tion proposed by Dirac, the front form, consists in definingthe initial conditions over a three-dimensional surface inthe space-time that is formed by a plane wave front ad-vancing with the velocity of light. This latter form is alsocommonly referred to as the light front, defined by x+ =x0+x3 and x− = x0−x3, and the dynamics in this systemof coordinates is called light front dynamics. Of these, thelight front has attracted much attention and research forits peculiar singular properties.In the light front the x+ coordinate is usually taken as theparameter for the temporal evolution for the system andthe problem of Cauchy’s initial values turns out to be acharacteristic problem of initial values[2, 3] in which initialdata must be established over a pair of planes known asnull planes (x+ = 0) that intercept each other.The use of light front coordinates in Quantum Field Theo-ries has shown a curious result[4]. Works on regularizationin light-front has been the focus of studies in recent years[5,6]In this work will we calculate the dimensional regulariza-tion in the calculation of the 4-point function to order g2

in terms of light front coordinates and the lowest order cor-rections to the 4-point functions of φ4 theory is obtained.References[1] P.A.M. Dirac, Mod. Phys. 21 392. (1949)[2] A. Neville and Rohrlich, Nouv. Cim. A1,625 (1971)[3] T. Heinzl and E. Werner, Z. Phys. C62, 521 (1994)[4] A.T. Suzuki, J.H.O. Sales, L.A. Soriano and J.D. Bol-zan, Few-Body Systems, p. 20-26 (2012).[5] J. Hiller, Pauli–Villars regularization of field theories onthe light front, hep-ph/arXiv:1010.0028 (2010)[6] S.S. Chabysheva, J.R. Hiller, Phys.Rev. D82, 034004(2010)

[26/04/12 - P013]The Lorentz transformation on the light front, isit possible?, L. A. Soriano, A. T. Suzuki, Institutode Fısica Teorica-UNESP, J. H. O. Sales, UniversidadeEstadual de Santa Cruz-UESC �The possibility to para-meterize the space-time of a relativistic system in the Lightfront has been the subject of research for more than half acentury.In 1949 Dirac[1] constructed three different forms of relati-vistic dynamics, depending on the hypersurface type cho-sen to describe the temporal evolution of the system: The


instant form, whose surface is specified by the initial con-ditions at t = 0; the point form, whose surface is specifiedby the initial conditions at x.x = k.k and t > 0 with cons-tant k, and the front form, whose surface is tangential tothe light cone, which is defined by the initial conditions att+ z = 0. The latter form is also commonly referred to asthe light front.In the light front the x+ coordinate is usually taken as theparameter for the temporal evolution for the system. Theinitial boundary conditions for the dynamics in the lightfront is defined by the hyperplane x+ = 0. Therefore, inanalogy to the displacement of the four-dimensional space-time, the displacement of the hyperplane is given from x+ =0 to x+ > 0.The possibility of developing the dynamics of a relativisticsystem in the form of light front is advantageous to solvethe problem of quantum field theory[2, 3, 4].Many applications in light front has shown interesting re-sults that deserve their special attention[5, 6, 7].The light front coordinate is not a Lorentz transformation,but is, in a certain sense, the limit of a Lorentz referenceframe moving in the z direction with nearly the speed oflight[4].In this work, we will construct the Lorentz transformationin the coordinates of the light front, and we will derive,from it, the time dilation and space contraction in thesecoordinatesReferences[1] P.A.M. Dirac, Mod. Phys. 21 392. (1949).[2] S. Fubini and G. Furlan, Physics 1 229 (1965).[3] S. Weinberg, Phys. Rev. 150,1313 (1966)[4] L. Susskind, Phys. Rev. 165, 1535 (1968)[5] J.H.O. Sales, A.T. Suzuki, Int Theor. Phy. 48 2340-2352 (2009)[6] J.P.B.C de Melo, J.H.O. Sales, T. Frederico and Sauer,Nucl. Phys. A 631 574-579 (1998)[7] A.T. Suzuki, J.H.O. Sales, L.A. Soriano and J.D. Bol-zan, Few-Body Systems, p. 20-26 (2012).

[26/04/12 - P014]Heavy Meson Spectrum in an Semi-Analytical ap-proach to the Static Quark Potential RelativisticWave Equation, Andre Luiz Mota, Heron Caldas,

Universidade Federal de Sao Joao del Rei, Jose Erinaldo

da Fonseca, Universidade de Brasilia �The obtaining ofbound states of two particles interacting throughout theRichardson static quark potential in the context of relati-vistic quantum mechanics is revisited here. The exact so-lutions to this equation are known for only a certain classof potentials, and general solutions can be obtained onlynumerically. In this work, we study approximated analyti-cal solutions to the binding energies of a bound state of onelight- and one heavy-quark. The approach consists in intro-ducing an ansatz solution to the relativistic Klein-Gordonequation, written in terms of a unknown parametric func-tion. This approach allows the obtaining of a relativisticequation very similar to the non-relativistic quantum me-chanics spherical potential problem, with very well-knownsolutions. The binding energies are dependent on the firstderivatives of the parametric function, and a differentialequation to this function can be found. This equation can

be solved analytically within some approximations, provi-ding analytical expressions to the wave function of the he-avy meson. Also, it is possible to find out exact numericalsolutions, providing accurate estimative to the heavy me-sons spectrum. By using the best estimative to constituentquark masses, the procedure employed here makes use ofa set of only two free parameters, in contrast with othermore expensive approaches found in literature. The spinscontribution is considered, and the results are compared toboth experimental and other theoretical results. We alsoevaluate the extension of the approach to light mesons.

[26/04/12 - P015]Z(N) Spin-Gauge Systems in the Lattice,A. R. J. Barreto, M. Chiapparini, Universidadedo Estado do Rio de Janeiro - RJ - Brazil �One of themost important areas where Monte Carlo techniques con-tributes is that of lattice gauge theories. Gauge theories arehighly non-treatable in the low energy domain, because oftheir non-linear behavior coming from the self-interactionterms in the Lagrangian. Non-perturbative methods arenecessary in the low energy domain of gauge theories.Solving the theory numerically on the lattice is probablythe most powerful method to attach the problem. Whenformulated in the lattice, gauge theories are equivalent toa Statistical Mechanics model, allowing the employmentof Monte Carlo numerical simulations. In this work westudy the Abelian case of Z(N). We have considered a setof Z(N) pure spin-gauge systems in a 4-dimensional latticeusing Monte Carlo techniques . The gauge field variablesare localized on the links of the lattice. It is possible alsoto add spin variables localized on the lattice sites, but inthis work we have focused only on the pure gauge case.We study the cases with N=2,3,4,5,6,7,8,9,10,20. Whenplotting the Wilson loop as a function of the self couplingconstant, it is possible to identify a phase transition.The critical value of the coupling constant was obtainedstudying different sizes of the lattice, and it is showed as afunction of N.

[26/04/12 - P016]Searching of Gravitational Waves Signals from Mil-lisecond Pulsars, Fernanda Gomes de Oliveira,

Rubens de Melo Marinho Jr, Jaziel Goulart Coe-

lho, Instituto Tecnologico de Aeronautica, Nadja Simoes

Magalhaes, Universidade Federal de Sao Paulo �Thedirect detection of GW is one of the biggest experimentalchallenges today. After more than three decades of rese-arch and development in GW detectors, at least, the firstdetection of a GW on Earth is expected in the near fu-ture. This work is focused on the detection of monochro-matic gravitational wave (GW) signals from pulsars usingdata of ALLEGRO’s resonant bar antenna. It makes useof a method tailored for the detection of monochromaticsignals in the middle of strong noise, which basically it mo-nitor, for a given frequency, the excess power in the powerspectrum of the data. An analysis is performed on the fre-quency of 47 Tucanae pulsars, searching for frequency driftsthat might present a pattern similar to the one due to theDoppler modulation. The method is expected to be usefuleven in the presence of very noisy data, by reducing thenoise to a level inferior to the one of the monochromatic


signals and performing the Doppler modulation analysis.We tested the method injecting a simulated signal in realdata and we were able to detect it. We made a statisti-cal study about the results of this method. The selectionof candidate events will then be established according toNeyman-Pearson criterion. We will show that the methodis efficiently because we can recover the simulation signal,but unfortunately we can not detect the GW signals in thisanalysis.

[26/04/12 - P017]The effect of the a confining propagator in TCmodels, Adriano Doff Sotta Gomes, UniversidadeTecnologica Federal do Parana - UTFPR - COMAT Viado Conhecimento Km 01, 85503-390, Pato Branco - PR,Brazil, Fatima Araujo Machado, Instituto de FısicaTeorica, UNESP Rua Pamplona, 145, 01405-900, SaoPaulo - SP, Brazil, Adriano Antonio Natale, Institutode Fısica Teorica, UNESP Rua Pamplona, 145, 01405-900,Sao Paulo - SP, Brazi � Recently Cornwall introdu-ced a confinement effect[1] explicitly into the gap equa-tion through the following effective propagator, Dμν

eff (k) ≡δμν 8πKF

(k2+m2)2 , where KF is the string tension. This propa-

gator has an Abelian gauge invariance that appears in thequark action obtained by integrating over quark world linesimplying an area-law action.

Due to entropic reasons as demonstrated in Ref.[1], wemust necessarily have a finite m �= 0 value and its valueis related to the dynamical quark mass (m ≈ M(0)), asrequired by gauge invariance originating a negative term−KF/m in the static potential in order to generate theGoldstone bosons associated to the chiral symmetry brea-king. The first term of static potential is linear with thedistance and proportional to KF , the linear confining po-tential felt by quarks has been observed in the lattice si-mulations, and is a strong justificative for the confiningeffective propagator.

In this work we extend some results of Ref.[2] to TCmodels[3], in particular the same mechanism works for te-chnicolor with dynamically massive technigluons and boththeories develop a hard self-energy dynamics, resulting froman effective four-fermion interaction[3]. We outline a quitegeneral type of technicolor model that may naturally ex-plain the masses of different fermion generations.

[1] J. M. Cornwall, Phys. Rev. D 83 (2011) 076001 .[2] A. Doff, F. A. Machado and A. A. Natale, Annals of Physics

327 (2012) 1030 .[3] A. Doff, F. A. Machado and A. A. Natale, hep-ph 1112.3087.

[26/04/12 - P018]Search for high-mass dilepton resonances in 5/fb ofpp collisions at sqrt(s) = 7 TeV with ATLAS de-tector, Andre Asevedo Nepomuceno, UniversidadeFederal Fluminense �The ATLAS detector is used to se-arch for high-mass resonances, such as heavy neutral gaugebosons (Z’), Randall-Sundrum gravitons, decaying to anelectron-positron pair or a muon-antimuon pair. The li-mits are calculated using Bayesian statistics by comparingthe invariant mass distributions of data and predicted Z’signals. The cuts used to selected the signal are descri-bed, as well as the signal efficiencies for electron and muonchannels. Methods to estimate the QCD background arealso take into account. Results are presented based on theanalysis of pp collisions at a center-of-mass energy of 7 TeVcorresponding to an integrated luminosity of approximately5/fb. A Z’ with standard model couplings is excluded at 95percent CL for masses below 2.07 TeV in the electron chan-nel, 1.96 TeV in the muon channel, and 2.20 TeV in the twochannels combined. Limits on Z’ from E6 inspired modelsare also obtained. A Randall-Sundrum graviton with cou-pling k/Mpl = 0.1 is excluded for masses below 2.03 TeVin the electron channel, 1.89 TeV in the muon channel, and2.15 TeV in the two channels combined.

[26/04/12 - P019]A light in the Dark Sector with a Stu-

eckelberg extension of the Standard Model,Alexander Lunkes dos Santos, Dimiter Hadjimi-

chef, UFRGS �One of the most attractive candidates fordark matter are thermal weakly interacting massive par-ticles (WIMPs). In addition to appearing generically intheories of weak-scale physics beyond the Standard Model(SM), they naturally give the appropriate relic abundance.Such particles also are very promising in terms of direct andindirect detection, because they must have some connectionto SM particles. In this context, extensions of the SM canintroduce candidates for these dark matter particles. A newinteraction for the dark sector can arise naturally in a va-riety of theories of physics beyond the SM, and is thus wellmotivated from a theoretical point of view. In this sense,we investigate a model that describes physics beyond theSM by the inclusion of two additional U(1) gauge bosons.We first extend the gauge sector by adding a new massiveboson, via minimal coupling, the Z ′. A second U(1) boson,now from the dark sector, is coupled to the first one by theStueckelberg mechanism. The Stueckelberg Lagrangian isa gauge invariant kinetic term for a massive abelian vectorfield, that utilizes a non-linear representation of the gaugetransformation. The mass term is made gauge invariantby coupling a massless gauge boson to a real pseudo-scalarfield, which then transforms non-linearly, and in unitarygauge is absorbed as the longitudinal mode of the massivevector. The relevance of the Stueckelberg mechanism lies inthe fact that it is an alternative to the Higgs mechanism, inorder to achieve gauge symmetry breaking without spoilingrenormalizability. A consequence of this field coupling isthe appearance of a new physical boson, the Z ′′. However,


the Z ′′ does not interact directly with the SM fermions.So the calculation results in a massive boson Z ′ and in aphoton-like massless Z ′′ in dark sector, due to the fact thatthe Stueckleberg mechanism gives mass to only one boson.Constraints on the mass for Z ′ and corrections to Z massare obtained.

[26/04/12 - P020]An alternative approach to exact solutions of time-dependent nonlinear Schrodinger equation withquartic and quintic nonlinearities, Luis Enri-

que Arroyo Meza, , Alvaro de Souza Dutra,

Marcelo Batista Hott, UNESP-Campus de Guaratin-gueta �

Talks (17h30 - 19h30)

Talks - Session 07

[26/04/12 - 17h30 - Local: Salao Chardonnay]Fluctuations and the QCD phase transition,Volker Koch, Lawrence Berkeley National Laboratory,Berkeley, USA �Understanding the properties of the nu-clear matter when subjected to extremes of temperatureand density is one of the goals of the relativistic heavy-ioncollision program. The knowledge of the properties mani-fested in these collisions should have some connection toour understanding of the early universe and how hadronsacquire their masses. QCD suggests we should at least ex-pect two types of transitions for nuclear matter in limits ofhigh temperature (T) and densities : deconfinement tran-sition and chiral phase transition. Theoretically the decon-finement measure is the order parameter, Polyakov loop,which depends on the potential between a static quark-antiquark pair separated by a distance r. The measure ofchiral transition is the order parameter, the chiral conden-sate In a medium of strongly interacting elementary parti-cles, described by equilibrium thermodynamics of QuantumChromodynamics (QCD), the transition between the low-temperature hadronic and high-temperature quark- gluonphase occurs in a small temperature interval and leads toa rapid change in entropy and energy density. Althoughit is, most likely, that this transition is not a true phasetransition, but rather a smooth but rapid crossover, it isexpected that this transition leads to large fluctuations ofenergy and net quark number densities. In this talk I willdiscuss various observable which may be used to explore theQCD Phase structure in heavy ion collisions. Constraintsdue to global conservation laws will also be addressed.

[26/04/12 - 18h00 - Local: Salao Chardonnay]The QCD Phase Diagram Under Magnetic Fi-elds, Sidney S. Avancini, , Debora P. Menezes,

Marcus Benghi Pinto, UFSC - Universidade Federal deSanta Catarina, Constanca Providencia, Universidadede Coimbra, Coimbra, Portugal �The fact that magneticfields induce magnetic catalysis, enhancing chiral symme-try breaking, naturally leads to the question of how thesefields influence chiral phase transitions at finite temperatu-res and/or chemical potentials. This is more than merely anacademic question since one can immediately point out atleast two realistic scenarios whose physics is influenced by

the behavior of strongly interacting matter under intensemagnetic fields. The first refers to the high temperatureand low chemical potential regime which is relevant to noncentral heavy ion collisions where huge fields, of the order|eB| ≥ m2

π ∼ 1018G, can be created by heavy ion currentswhich are due to the spectator nucleons. The second sce-nario refers to the cold baryon-dense matter which formscompact stellar objects such as magnetars. While ordinaryneutron stars, also known as pulsars, bear a magnetic fieldof the order of 1012 − 1013G magnetars, which are belie-ved to be the source of intense gamma and X rays, bearfields of the order of 1014−1015G. As far as phase transiti-ons are concerned, these two physically appealing situationsare located at the high-T –low-μ and low-T –high-μ extremesof the QCD phase diagram while the intermediate regionlies within the capabilities of new experiments. However,despite the recent progress made at vanishing baryon den-sity, very little has been done to determine the influence ofmagnetic fields on the whole T − μ plane. In this talk wewill present results obtained by considering the three flavorNambu–Jona-Lasinio model in the mean field approxima-tion. We will discuss how the whole QCD phase diagramcan be influenced by the presence of strong magnetic fieldspaying special attention to the critical end point location.

[26/04/12 - 18h30 - Local: Salao Chardonnay]Transient Relativistic Fluid Dynamics from WeylInvariance, Jorge Noronha, Instituto de Fisica, USP�During the last decade, relativistic fluid dynamics hasbeen used as one of the main theoretical tools in the studyof the hot and dense matter created in heavy-ion collisionsat RHIC and, most recently, at LHC. While the propertiesof non-relativistic fluids are now well understood, the non-trivial physical consequences imposed by causality and sta-bility of relativistic fluids are still under intense theoreticalinvestigation. We argue, using the AdS/CFT correspon-dence, that the transient dynamics of the shear stress tensorin a strongly coupled N = 4 SYM plasma is not describedby relaxation-type, fluid dynamical equations: at long ti-mes the equations of motion should contain a second-ordercomoving derivative of the shear stress tensor. This occursbecause in this strongly-coupled system the lowest “non-hydrodynamical”quasinormal modes associated with shearstress possess a nonzero real part at zero wavenumber. Weuse Weyl invariance to obtain the most general equations ofmotion containing 2 comoving derivatives of the shear stresstensor that are compatible with the symmetries. We showthat the asymptotic solution of this theory valid at timesmuch larger than the timescale associated with the “non-hydrodynamical”modes reproduces the well-known resultspreviously obtained directly from the AdS/CFT correspon-dence. If the QGP formed in heavy ion collisions can be atleast qualitatively understood in terms of strongly-coupledN = 4 SYM theory, the second time derivative present inthe equations of motion of the fluid may lead to an unexpec-ted dependence on the initial conditions for the shear stresstensor needed in numerical hydrodynamic simulations.

[26/04/12 - 19h00 - Local: Salao Chardonnay]Dilepton resonances in proton proton collisons,Yara do Amaral Coutinho, IF UFRJ, RJ �We studythe double-charged vector-bilepton pair production and


double-charged scalar-bilepton pair production via p+p −→Y ++ + Y −− +X and p+ p −→ S++

1 + S−−1 +X , where Y

and S1 are vector and scalar bileptons respectively, in theframework of the minimal version of the 3-3-1 model. Wecompute the photon, Z, and Z ′ s-channel contributions forthe elementary process of bilepton scalar pair production,and to keep the correct unitarity behavior for the elemen-tary qq interaction, we include the exotic quark t-channelcontribution in the vector-bilepton pair production calcula-tion. We explore a mass range for Z ′ and we fix the exoticquark mass within the experimental bounds. In this mo-del, the vector-bilepton mass is directly related to MZ′ andwe consider scalar mass values around the vector-bileptonmass. We show that the total cross section for vector-bilepton production is 3 orders of magnitude larger thanfor scalar pair production for

√s = 7 TeV and 14 TeV and

we obtain the number of events for the proposed LHC lu-minosities as a function of the bilepton mass. In additionwe present some invariant mass and transverse momentumdistributions. When comparing these distributions we ob-serve quite different behavior providing the determinationof the bilepton nature. We conclude that one can disentan-gle the production rates and that the LHC can be capableof detecting these predicted particles as a signal for newphysics.

[26/04/12 - 19h30 - Local: Salao Chardonnay]Negative parity baryon decays in the 1/Nc expan-sion, Chandana Jayalath, , Department of Phy-sics, Peradeniya University, Peradeniya 20400, Sri Lanka,Jose L. Goity, Department of Physics, Hampton Uni-versity, Hampton, Virginia 23668, USA; Thomas Jeffer-son National Accelerator Facility, Newport News, Virginia23606, USA, Emiliano Gonzalez de Urreta, Depart-ment of Theoretical Physics, Comision Nacional de EnergıaAtomica, 1429 Buenos Aires, Argentina; CONICET, Riva-davia 1917, 1033 Buenos Aires, Argentina, Norberto N.

Scoccola, Department of Theoretical Physics, ComisionNacional de Energıa Atomica, 1429 Buenos Aires, Argen-tina; CONICET, Rivadavia 1917, 1033 Buenos Aires, Ar-gentina; Universidad Favaloro, Solıs 453, 1078 Bue �Thepartial decay widths of lowest lying negative parity baryonsbelonging to the 70-plet of SU(6) are analyzed in the fra-mework of the 1/Nc expansion. The channels consideredare those with single pseudoscalar meson emission. Massesand partial decay widths are the main quantities charac-terizing baryon resonances. These quantities can be defi-ned and obtained through partial wave analyses where theconstraints of unitarity and analyticity of the S-matrix arefulfilled. In principle, they can be given unambiguous me-aning, through pole positions in the complex energy plane.A rigorous approach in which the 1/Nc expansion is imple-mented alongside with those analyses is yet to be developed,but it has been initiated. The analysis presented here aimsat providing a 1/Nc expansion for the Breit-Wigner partialdecay widths, and is therefore limited in its rigor in thesense just mentioned. The present work extends the analy-sis of partial decay widths of the negative parity baryonsto include the decays of the strange members of the 70-plet as well as the decays of the non-strange members intohyperons. The improvement in the present work, which is

carried out to include 1/Nc corrections and SU(3) breakingto first order, is in including up to 2-body SU(3) preservingand 1-body SU(3) breaking operators. Conclusions aboutthe magnitude of SU(3) breaking effects along with predic-tions for some unknown or poorly determined partial decaywidths of known resonances are obtained.

[26/04/12 - 20h00 - Local: Salao Chardonnay]The Competition of Superconductivityand Chiral Symmetry Breaking in Quasi-Two-Dimensional Dirac Fermionic Systems,Lizardo Henrique Cerqueira Moreira Nunes, Ri-

cardo Sonego Luciano Farias, Universidade Federalde Sao Joao del Rei, Eduardo Cantera Marino,

Universidade Federal do Rio de Janeiro �We investigatethe effect of superconducting and excitonic interactions, aswell as their competition, on Dirac electrons on a bipartiteplanar lattice. It is shown that, at half-filling, Cooper pairsand excitons coexist if the superconducting and excitoniccoupling parameters are equal and above a thresholdcorresponding to a quantum critical point. In the casewhere only the excitonic interaction is present, we obtain acritical chemical potential, as a function of the interactionstrength. Conversely, if there is only the superconductinginteraction in the system, a remarkable result was obtainedfor the case: λsc < α/Λ the superconducting gap displays adome-shaped curve as a function of the chemical potential,indicating the appearance of superconductivity as chargecarriers are added to the system. We emphasize that thiscurve actually vanishes exponentially as μ → 0 , hencesuperconductivity persists down to μ = 0, below sometemperature. This is in agreement with the fact thatCoopers theorem must be valid for μ �= 0, when a Fermisurface builds up. Finally, we have analyzed the possibilityof coexistence between Cooper pairs and excitons for μ �= 0and we show that, even if the excitonic interaction strengthis greater than the superconducting interaction, as thechemical potential increases, superconductivity tends tosuppress the excitonic order parameter, even if λexc > λsc.



Lecture: Petreczky III


Talks (10h30 - 11h30)

Talks - Session 08

[27/04/12 - 10h30 - Local: Salao Chardonnay]SGRs and AXPs: White Dwarf Pulsars versusMagnetars, manuel malheiro, Instituto Tecnologicode Aeronautica, Jorge Rueda, Remo Ruffini, SapienzaUniversity and ICRANet �The recent observations of SGR0418+5729 offer an authentic Rosetta Stone for decipheringthe energy source of Soft Gamma Ray Repeaters (SGRs)and Anomalous X-ray Pulsars (AXPs). The magnetar mo-del, appeals to a yet untested new energy source in as-trophysical systems: a primary energy source due to bulkmagnetic energy. It leads for SGR 0418+5729 to results incontradiction with observations. It is shown how a consis-tent model for SGRs and AXPs can be expressed in termsof canonical physics and astrophysics within massive, fastrotating, and highly magnetized white dwarfs. The pione-ering works of M. Morini et al. (1988) and of B. Paczynski(1990) are extended and further developed to describe theobserved properties of all known SGRS and AXPs by assu-ming spin-down powered massive, fast rotating, and highlymagnetized white dwarfs. Within this model, we obtain thetheoretical prediction for the lower limit of the first timederivative of the rotational period of SGR 0418+5729. Be-sides the case of SGR 0418+5729, we also show that theenergetics of all SGRs and AXPs, including their outburst

activities can be well explained through the change of rota-tional energy of the white dwarf, associated to the observedglitches, the sudden changes of the rotational period. Forall sources, we find a surface dipole magnetic field well be-low the critical field.

[27/04/12 - 11h00 - Local: Salao Chardonnay]Deconfinement to Quark Matter in Neutron Stars,Veronica Dexheimer, UFSC �We study the deconfi-nement to quark matter in the core of neutron stars usingan extended hadronic and quark SU(3) non-linear sigmamodel. The choice of potential for the deconfinementorder parameter as a function of temperature and chemicalpotential allows us to construct a realistic phase diagramfrom the analysis of the order parameters of the system.In this way, the degrees of freedom change naturally fromhadrons to quarks as the density and/or temperatureincreases. The nuclear matter liquid-gas transition is alsoreproduced. Besides agreeing with lattice QCD results, forzero and low chemical potential, we are also in agreementwith neutron star observations for zero temperature. Theeffects of strange particles, as well as high magnetic fieldscan be seen in the macroscopic properties of the star, suchas mass, radius and in the predicted cooling curves.


Lecture: Lipari III


INFN and Dipartimento di Fisica University of Roma, Italy�These lectures want to give an introduction to the presentstatus of Astroparticle Physics, giving special emphasis to adiscussion of the importance of the description of hadronicinteractions in the interpretation of the observations of cos-mic rays at the highest energy. Over recent years there hasbeen marked growth in interest in the study of techniquesof cosmic ray physics by astrophysicists and particle physi-cists. Cosmic radiation is important for the astrophysicistbecause in the farther reaches of the universe. For particlephysicists, it provides the opportunity to study neutrinosand very high energy particles of galactic origin. More im-portantly, cosmic rays constitue the background, and insome cases possibly the signal, for the more exotic uncon-firmed hypothesized particles such as monopoles and spar-ticles. Focusing on the highest energy cosmic rays, theselectures describe where they originate, acquire energy, andinteract, in accreting neutron stars, supernova remnants,in large-scale shock waves. It is reviewed also their inte-ractions in the atmosphere and in the earth, how they arestudied in surface and very large underground detectors,and what they tell us. The lectures will include a summaryof recent results in cosmic rays, gamma astronomy and neu-trino astronomy, and a brief discussion of the study of thenature of Dark Matter from observations of cosmic ray flu-xes. The study of the cosmic rays at the highest energiesrequires the modeling of hadronic interactions up to a c.m.energy of 400 TeV. Measurements at LHC can help in theextrapolation to these energies.

Index

Aguilar, A. C., 6Amaral, J. T. S., 6, 11Arriola, E. R., 5, 6Assis, L. P. G., 2, 11Avancini, S. S., 12

Barreto, A. R. J., 11Barros jr, C. C. B., 2Basso, E., 2Bastos, R. S., 11Batista, M. G. C., 11Bediaga, I., 2, 8Bertin, M. C., 11Betemps, M. A., 2Binosi, D., 6Bracco, M., 8Bracco, M. E., 2Bufalo, R., 11

Caldas, H., 11Carvalho, F., 2, 3Casali, R., 7Castro, R. K., 2Cavagnoli, R., 7Cazaroto, E., 2Chiapparini, M., 2, 7, 11Coelho, E. L., 7Coelho, J. G., 6, 11Collaboration, F. T. A., 2Coutinho, Y. A., 12Crede, V., 10Cruz Filho, J. P., 6Cucchieri, A., 5Cunha, E., 2

Delfino, A., 2Denke, R. Z., 6Deppman, A., 4Dexheimer, V., 13Dias1, J. M., 3Duarte, D. C., 6Duarte, S. B., 2, 7, 11Ducati, M. B. G., 1Ducati, M. B. L. G., 3Dumm, D. G., 8Dutra, A. S., 11

Endler, A. M., 7Entem, P. G. O. A. D. R., 10Espindola, D. B., 2

Fagundes, D. A., 2Farias, R. L. S., 6Farias, R. S. L., 12Favart, L., 1Fazio, S., 1Fernandez, F., 10Ferrari, G. N., 6, 7Ferreira, E., 3Figueredo, M. A. S., 2Florkowski, W., 4Fogaca, D., 7Fogaca, D. A., 7Fonseca, J. E., 11Franzon, B., 7Franzon, B. C. S., 7

Frederico, T., 2Frigori, R. B., 6Furtado, U. J., 7

Gama, F. J. A., 2Garcia, A. F., 7Gay, M. B., 2Giacosa, F., 10Goity, J. L., 12Gomes, A. D. S., 11Gomes, R. O., 7Goncalves, H. A. R., 7Goncalves, V., 2Goncalves, V. P., 2, 6, 11GONCALVES, V. P. B., 3Goncalves, V. P. B., 2, 3, 11Goncalves, V. P. B., 2Grassi, F., 4Griep, M. T., 3Guimaraes, K. S. F. F., 2

Hadjimichef, D., 11Higa, R., 5Hirsch, L., 2Hott, M. B., 11

Izidorio, C. A. A., 2

Jayalath, C., 12

Koch, V., 12Kodama, T., 3Kohara, A. K., 3Kolck, U. V., 5Kovacs, P., 10Kovchegov, Y., 1, 5, 9Krein, G., 6Kugeratski, M., 2

Leme, R., 6Lipari, P., 1, 5, 13Liu, C. -., 5Lopes, L. L., 7

Maas, F. E., 10Machado, F. A., 6, 11Machado, M. M., 2Machado, M. V. T., 3Macias, J. C., 6Mackedanz, L. F., 2Magalhaes, P. C., 2Magalhaes, N. S., 11Malheiro, M., 6malheiro, M., 13Marinelli, J. R., 7Marinho Jr, R. M., 11Marino, E. C., 12Mariotto, C. B., 2Marquet, C., 1Martins, S., 2Matheus, R. D., 3Mello, C. S., 6Melo, J. P. B., 11Mendes, T., 5, 6Menezes, D., 7Menezes, D. P., 7, 12

51

Menon, M. J., 2Mereghetti, E., 5Meza, L. E. A., 11Mihara, A., 6Mintz, B. W., 6Mirez, C., 11Moreira, B. D. S., 11Mota, A. L., 11

Nobrega, F. K., 2Narison2, S., 3Natale, A., 5, 6Natale, A. A., 11Navarra1, F. S., 3Navarra, F., 2, 11Navarra, F. S., 3, 7Nepomuceno, A. A., 11Nielsen1, M., 3Nielsen, M., 3Noronha, J., 12Novello, C., 3Nunes, L. H. C. M., 12

Oliveira Filho, E. P., 2Oliveira, E., 2Oliveira, E. G., 3Oliveira, F. G., 11Oliveira, J. C. T., 7

Pagura, V. P., 8Papavassiliou, J., 6Parganlija, D., 10Paula, W., 2Petreczky, P., 5, 9, 13Pimentel, B. M., 11Pimentel, B. P., 11Pinto, M. B., 6, 7, 12Ploskon, M. A., 10Providencia, C., 7, 12Providencia, C., 6

Ramos, R. O., 6Reis, A. C., 2Richard3, J., 3Rischke, D., 10Robillota, M., 2Rocha, A. S. S., 7Rocha, C. A., 6Rodrigues, B. O., 2Rodrigues, H., 7Rodriguez, M. C., 2Rueda, J., 13Ruffini, R., 13

S Filho, J. P. B. C. M. A. V. S., 6S Filho, O. L. S., 2Sales, J. H. O., 11Sanches, S., 11Santos Filho, V., 11Santos, A. L., 11Santos, B. M., 11Santos, G. S., 2Sauter, W., 2SAUTER, W. K., 3Sauter, W. K., 11Schaffner-Bielich, J., 6Scoccola, N. N., 8, 12Serenone, W., 6SILVA, D. T., 3

Silva, E. O., 6Silva, M. L. L., 3Silva, P. V. R. G., 2Silva, R. R., 2, 6Soriano, L. A., 11Sousa, M. S. M., 6Souto, W. A., 7Souza Filho, V., 10Souza, A. N., 11Souza, R. G., 11Stetcu, I., 5Stiele, R., 6Strickland, M., 4Suzuki, A. T., 11Szpigel, S., 6

Teixeira Junior, D. L., 6Thiel, M., 11Timoteo, V. S., 6Timmermans, R. G. E., 5Timoteo, V. S., 10Tomio, L., 11Trevisan, L. A., 11Typel, S., 1, 9, 10

Urreta, E. G., 12

Valcarcel, C. E., 11Vasconcellos, C. A. Z., 7Vries, J., 5

Woitek, M., 6Wolf, G., 10

Zambrano, G. E. R., 11Zanetti, C. M., 3

52

lectures (10h30 - 12h30) - 23/04/12 filelectures (10h30 - 12h30) - 23/04/12

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