LAPE is the “Laboratório de Física de Partículas Experimental” (Laboratory of Experimental Particle Physics) of the Physics Institute at the Federal University of Rio de Janeiro, Brazil. The LAPE collaboration with CERN started in 1993, in the context of the DELPHI experiment, which has finished operation at LEP in 2002. In 1998, LAPE joined the LHCb collaboration, which will investigate the physics of CP violation in B meson decays produced at the LHC collisions.

• Tau lepton Physics at LEP1

• Study of the decay (K) (branching ratio and polarization)• Study of the decay a1() (branching ratio and polarization)• Study of the decay 0) (branching ratio) • Measurement of the Michel parameters in the decay ee

Leandro de Paula and Sandra Amato Master Students: Danielle Moraes, Érica Polycarpo and Tatiana da Silva PhD Student: Maurício Barbi

• Search for physics beyond the standard model

• Search for second class current contribution to the decay w(0) at LEP1• Search for a heavy lepton at LEP1• Search for the Tau lepton SUSY partner, the Stau at LEP2.• Search for SUSY with spontaneously broken R parity at LEP

José Helder Lopes, Leandro de Paula, Miriam Gandelman and Sandra Amato PhD students: Danielle Moraes, Maria Aline Barros do Vale and Tatiana da Silva Collaborator: Mikael Bergreen (Paris VI)

• Participation on detector development and tests

• Microvertex silicon detector• TPC silicon detector for sinchrotron radiation monitoring at LEP2.• STIC veto system • RICH distillation plant

Miriam Gandelman, Bernard Maréchal and Fernando Marroquim Master Students: Danielle Moraes, Érica Polycarpo and Tatiana da Silva PhD Student: Maurício Barbi Collaborators: Hans Dijkstra, Paula Collins, Igor Stavitski (CERN)

Marcos Gaspar and Patrice Siegrist (CERN) Alberto Benvenuti (CERN)

Christian Joram and Erich Albrech (CERN)

• Data acquisition and data control systems

• Quality checking of reconstructed data• Data acquisiton

Diego Carvalho e Sandra Amato Collaborators: Philippe Gavillet and Daniel Ruffinoni (CERN)

Student formation

• 11 theses• 2 PhD in DELPHI • 4 PhD in LHCb (2 ongoing)• 2 PhD both in DELPHI and LHCb • 3 Master in DELPHI• 2 Master in LHCb (1 ongoing)

• Study of physics performance for the decays

• BJ/ K0s

• B0s

• B D K* • B J/() K*• B l l K*

João Torres de Mello Neto, José Helder Lopes, Leandro de Paula , Miriam Gandelman and Sandra Amato

Master Students: Franciole Cunha, Kazuyoshi Akiba PhD Students: Bruno Souza de Paula, Cláudia Pereira Nunes, Érica Polycarpo and Kazuyoshi

Akiba

• Software development

• Muon identification software

João Torres de Mello Neto and Miriam Gandelman PhD Students: Cláudia Pereira Nunes and Érica Polycarpo PosDoc: André Massafferri Collaborator: Paul Colrain (CERN)

• Muon Digitization in SICb

José Helder Lopes, Miriam Gandelman and Sandra Amato Collaborator: Paul Colrain (CERN)

• L0 Muon Trigger

PhD Student: Tatiana da Silva Collaborators: Elie Aslanides and Renaud Legac (CPPM)

• Monte Carlo production and quality check

Miriam Gandelman Collaborator: Andrei Tsaregorodtsev (CPPM), Eric van Herwijnen and Joel Closier (CERN)

• Trigger and tagging

Leandro de Paula and Sandra Amato PhD Student: Bruno Souza de Paula Collaborators: Hans Dijkstra (CERN)

• Participation on the development of MRPCs and MWPCs for the Muon system

Bernard Maréchal , Miriam Gandelman and Leandro de Paula PhD Student: Érica Polycarpo Collaborators: Burkhard Schmidt, Jose Lamas-Valverde, Thomas Schneider and Werner Riegler

(CERN), Alexei Vorobiev , Anatoli Katchouki, and the PNPI Group (PNPI).

• Participation on the development of the muon chambes front-end electronics (CARIOCA)

PhD Student: Danielle Moraes Collaborators: Pierre Jarron and Werner Riegler (CERN)

Organization of events

•DELPHI Meeting (Itacuruçá, December 1994)•Winter High Energy Physics School (Rio de Janeiro, July 1996)•LHCb Workshop (Rio de Janeiro, January 1998)•CERN-CLAF School of High Energy Physics (Itacuruçá, May 2000)•LHCb Week (Itacuruçá, September 2001)•ICFA School on Instrumentation in Elementary Particle Physics (December 2003)

CERN open day - 16th october 2004

Group Members at present

Miriam Gandelman, Kazuyoshi Akiba,

Leandro de Paula, Bernard Maréchal,

Sandra Amato, André Massafferri,

Érica Polycarpo, Franciole Marinho,

José Helder Lopes, Cristina Schoch

(from left to right in the picture) and

Bruno Souza de Paula (at CERN)