hadronic physics
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Hadronic Physics. Report from the Town Meeting October 25 Sebastian Kuhn, Old Dominion University. Agenda. Town Meeting “ Hadronic Physics” * 7:00 Medium Energy Physics Overview - Roy Holt * 7:40 The future of hadron physics - Craig Roberts - PowerPoint PPT PresentationTRANSCRIPT
Hadronic PhysicsReport from the Town Meeting October 25
Sebastian Kuhn, Old Dominion University
AgendaTown Meeting “Hadronic Physics”
* 7:00 Medium Energy Physics Overview - Roy Holt * 7:40 The future of hadron physics - Craig Roberts * 8:00 Nucleon structure with Jefferson Lab at 12 GeV - Latifa Elouadhriri * 8:20 QCD and nuclei - Larry Weinstein * 8:40 The RHIC spin program - Elke Aschenauer * 9:00 Hadronic physics at other facilities - Jen-Chieh Peng * 9:20 Open Mic - opportunity to present a few slides o Mark Pitt o Seamus Riordan * 9:40 Discussion and Closeout * 10:00 Adjourn
http://www.odu.edu/~skuhn/HadronTownMeet
Central Questions in Hadronic Physics
What is the Nature of Confinement?Spectroscopy and form factors of hadronsThe role of gluonic excitationsHadronization
What is the Internal Structure of the Nucleon? (1D → 3D)
How are spin and momentum distributed among partons?Correlations and 3D structureOrbital angular momentum of quarks
How do Nuclear Properties Emerge from Quarks and Gluons?
Are nucleons modified inside the nucleus?
HadronsDiscover meaning of confinement, and its relationship to DCSB* – the origin of visible mass
Overarching Science Challenges for the coming decade: 2013-2022
C.D. Roberts, Prog. Part. Nucl. Phys. 61 (2008) 50M. Bhagwat & P.C. Tandy, AIP Conf.Proc. 842 (2006) 225-227
*Dynamical Chiral Symmetry Breaking
HadronsMeson Spectroscopy -> AnomaliesSearch for exotic hadrons, e.g. hybrid mesonsPrecision experimental study of valence region, and theoretical computation of distribution functions and distribution amplitudesAccurate elastic and transition form factor data drive paradigmatic shifts in our pictures of hadrons and their structure; e.g.,
role of orbital angular momentum and nonpointlike diquark correlationsscale at which p-QCD effects become evidentstrangeness contentmeson-cloud effects9 Experiments @12 GeV JLab
Valence GlueNSAC milestone HP15 (2018)
Plot credit: NP2010
Exotics and hybrids are truly novel states
They’re not matter as we know itIn possessing valence glue, such states confound the distinction between matter fields and force carriers
But they’re only exotic in a quantum mechanics based on constituent-quark degrees-of-freedom
They’re natural in quantum field theory, far from the non-relativistic (potential model) limit
No symmetry forbids them, QCD interaction promotes them, so they very probably exist!
240 “PAC days” approvedGlueX and Hall B @12 GeV JLab
Excited Glue
Longitudinal
StructureNSAC milestone HP14 (2018)
JLab@12 GeV has unique capability to define the valence region
Helicity conservation
Scalar diquark
SU(6)
+BONuS 12 GeV Projected
9 Experiments @12 GeV JLab+ pp program at RHIC+ FNAL, ….
E.C. Aschenauer
DIS
RHIC200 GeV
RHIC500 GeV
forward h
Transverse Quark Motion
NSAC Milestone HP13 (2015) “Test unique QCD predictions for relations between single-transverse spin phenomena in p-p scattering and those observed in deep-inelastic scattering.”
JLab @12 GeV, COMPASS-II, RHIC-spin, polarized FNAL, FAIR/PANDA…
PhT
SIDIS Drell-Yan
Nucleon Tomography
Quark angular momentum (Ji’s sum rule)
X. Ji, Phy.Rev.Lett.78,610(1997)
( H(x,x,t=0) + E(x,x,t=0) ) x dx = Jquark-1
1=1/2 DS + D Lz
>9 Experiments @12 GeV JLab
Nucleons in Nuclei
Flavor, isospin and spin dependence of EMC effect? JLab@12, Drell-Yan, MINERvA
N. Fomin et al, PRL 108, 092502 (2012)
SRC Scaling factors xB ≥ 1.5
11 JLab 12 GeV experiments, incl. nuclear structure, nucleon modificationsand Color Transparency
J. Seeley et al, PRL 103 (2009)
L. Weinstein et al, PRL 106, 052301 (2011) , J. Arrington et al, arXiv:1206.6343
CT, Hadronization and All That
12 GeV Anticipated Data: 1035 cm-2s-1
CEBAF @ 12 GeV + CLAS12: ideal facility to study light quark hadronization:
)()(),,,( 22
DAQpzR h
DIS
hDIS
T
What governs the transition of quarks and gluons into pions and nucleons? NSAC 2007
W. Brooks, K. Hafidi, K. Joo et al.
Production lengthParton energy lossFormation lengthColor transparencyHadron multiplicitypT broadening
Jefferson Lab at 12 GeV
Scope of the project includes: • Doubling the accelerator beam energy• New experimental Hall and beamline• Upgrades to existing Experimental Halls
Maintain capability to deliver lower pass beam energies: 2.2, 4.4, 6.6….
New Hall
Add arc
Enhanced capabilitiesin existing Halls
Add 5 cryomodules
Add 5 cryomodules
20 cryomodules
20 cryomodules
Upgrade arc magnets and supplies
CHL upgrade
Upgrade is designed to build on existing facility: vast majority of accelerator and experimental equipment have continued use
The completion of the 12 GeV Upgrade of CEBAF was ranked the highest priority in the 2007 NSAC Long Range Plan.
Jefferson Lab at 12 GeVHall D – exploring origin of confinement by
studying hybrid mesons and rare decays
Hall B – understanding nucleon structure via PDFs, TMDs and generalized parton distributions
Hall C – precision determination of valence quark properties in nucleons and nuclei
Hall A – form factors, GPDs, nucleon structure Future new experiments (e.g., SoLID and MOLLER)
12 GeV – Upgrade StatusHall D – equipment installation in progress
Two high-gradient 12 GeV cryomodules installed
and delivering high quality beam; third moved to tunnel
CHL-2 equipment (compressors, coldboxes) in place
Superconducting magnets under constructionAll major detector systems under construction
All 48 Hall D BCAL modules on site (U. Regina) Region 2 DC CLAS12 completed (Old Dominion U.)
Performance Index: schedule 95% ; cost 96% Hall C DipolePrototype Coil
Hall B Pre-ShowerCalorimeter
Central Helium Liquefier-2installation
Third C-100 Cryomoduletransferred to tunnel
Hall D Interior
CLAS12 R2 final DC
Other Physics Topics @ JLab 12 GeV
Testing the Standard ModelParity Violating DIS: SoLID(and a rich program in hadronic Physics)
Parity Violating Möller Scattering
Direct Search for “Dark Photons”APEX, Dark light, HPS
RHIC Spin Program DSSV: arXiv:0904.3821
DSSV+: DSSV+COMPASSDSSV++: DSSV+ & RHIC 2009
DIS
RHIC200 GeV
RHIC500 GeV
forward h
RHIC W±-data will constrain and
Transverse Asymmetries
Other FacilitiesFermilab: Drell-Yan (pol. and unpol.), Neutrinos (Minera), Project X?
HigS (TUNL), Mainz, Bonn: Spectroscopy, ChPT Tests, form factors, polarizabilities few-body nuclei
COMPASS II (CERN): 1-3D SFs, Drell-Yan, GPDs , Primakoff
GSI / FAIR (Panda, PAX,…): Hadron Spectroscopy, Drell-Yan
J-PARC (strangeness), BES, PSI, …
…and ongoing analyses of existing data (JLAB, HERMES, RHIC,…)
Theory
Kamano, Nakamura, Lee et al., 2012
NSAC milestones HP3 (2009) completed, HP7 (2012)
Baryon spectrum from EBAC & Bonn-Ga (PDG12)
Lattice-QCDSignificant progress in the last five yearsThis must continue
Bound-state problem in continuum quantum field theory
Significant progress, tooMust also continue
Completed and planned experiments will deliver the pieces of the puzzle that is QCD. Theory must be developed to explain how they fit together
Hadron physics must deploy a diverse array of probes and tools in order to define and solve the problems of confinement and its relationship with Dynamical Chiral Symmetry Breaking
Summary and OutlookHadronic Physics is poised for an exciting time, major
breakthroughs
There is only one high-energy, high-intensity electron scattering lab left worldwide: Jefferson Lab @ 12 GeV
Large investment, extensive program (>7 years)Nearing completion, large contributions from users>50 approved proposals with 600 authors and 125 spokespersons
RHIC spin program will provide complementary data
Many other labs can make important contributions
Long-term goal for the community: EIC
> 7 years!