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Transcript of A QCD town meeting on hadron physics - Office of …/media/np/nsac/pdf/mtg 3807... · 5 Schedule...
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A QCD town meeting on hadron physics
January 12-14, 2007Rutgers University
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OrganizersSimon Capstick (Florida State University)Lawrence S. Cardman (Jefferson Lab)Abhay L. Deshpande (SUNY Stony Brook)Xiangdong Ji (University of Maryland), Co-ChairCynthia Keppel (Hampton University)Curtis Meyer (Carnegie-Mellon University)Zein-Eddine Meziani (Temple University), Co-ChairJohn Negele (MIT)Jen-Chieh Peng (Illinois)
Number of registered participants: 112
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ScheduleJan. 12,
Hadron structure at short distance Qiu, Chen, Makins, Vanderhaeghen
Hadron structure at long distance Arrington, Cates, Phillips, Griesshammer, Weller
Nuclear physics at short distanceGeesaman, Ransome, Brooks, Owens, Reinhold
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Schedule continues Jan. 13, Joint session with phases of QCD matter
JLab 12 GeV upgrade and RHIC II upgrade Thomas, Zajc
International opportunitiesWyslouch, Henning, Saito
QCD theoryKaplan, Negele
Electron-Ion ColliderKovchegov, Vogelsang, Surrow, Ent, Merminga
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Schedule continuesJan. 14,
Hadron spectroscopyBarnes, Dudek, Dzierba, Burkert, Lee, CredeHadron physics theorySteward, Szczpaniak, OrginosEducation and outreachCizewskiDiscussion of priority and recommendations
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What is the role of gluons in the nucleon and nuclei?What is the internal spin and flavor landscape of hadrons?How do hadron final states emerge from QCD quarks and gluons in high-energy scattering?What are the effective degrees of freedom describing hadron spectroscopy?What happen to the nucleons at short distance in a nucleus?
Key questions in hadron physics
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Accomplishment (since last long range plan)
Hadron structure at short distanceSea quark at large-xGeneralized parton distributionsTransverse-momentum-dependent distributionsSpin physics at RHIC
Hadron strucure at long distanceStrange form factorElectromagnetic form factors
SpectroscopyNuclear Physics at short distanceTheory
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Transverse-momentum dependent partondistributions and fragmentations
SiversAsymmetry
Collins Asymmetry
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Neutron spin asymmetry at large x
(Δu+
Δu−
)/(u
+u−
)
E99117
HERMES
x
(Δd+
Δd−
)/(d
+d−
)
−0.5
0
0.5
1
0 0.2 0.4 0.6 0.8 1
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GGeneralizedeneralized PPartonarton DDistributionsistributions
x + ξ x - ξ
P - Δ/2 P + Δ/2
*Qhard2 large t = Δ2
low –t process : -t << Qhard
2
GPD (x, ξ ,t)
at large Q2 : QCD factorization theorem hard exclusive process can be described by 4 transitions (GPDs) :
(x + ξ) and (x - ξ) : longitudinal momentum fractions of quarks
VectorVector :: H (x, ξ ,t)
TensorTensor :: E (x, ξ ,t)AxialAxial--VectorVector :: H (x, ξ ,t)
PseudoscalarPseudoscalar :: E (x, ξ ,t)
~~
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DVCS DVCS onon neutronneutron( ) EHHF )(
4~
)()()()( 22211 tFMttFtFtFCI
n −++= ξ
0 because F1(t) is small 0 because of cancelation of u and d quarks
Voutier, thesis M. Mazouz(Grenoble)
n-DVCS gives access to the least known and constrained GPD, E
JLabJLab // Hall A (E03Hall A (E03--106) : 106) :
preliminary data
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Nucleon form factors
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Search for New Baryon States
reactions beam pol. target pol. recoil status_____________________________________________________________
γp→Nπ,pη,pππ,KΛ/Σ - - Λ,Σ complete
γp→p(ρ,φ,ω) linear - - complete---------------------------------------------------------------------------------------------
γp→Nπ, pη, pππ, KΛ lin./circ. long./trans. Λ,Σ 2007
γD→KΛ, KΣ circ./lin. unpol. Λ,Σ 2006/2009
γ(HD)→KΛ,KΣ,Nπ lin./circ. long./trans. Λ,Σ 2009/2010
This program will, for the first time, provide complete amplitude information on the KΛ final state, and nearly complete information on the Nπ final states.
CLAS
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• PWA of data on γp→ K+Λ, K+Σ, K0Σ+
K+Σ0K+Λ
J. McNabb et al, PRC69 (2004)
New N* states in KΛ/KΣproduction?
• Analyses find needs for various new candidate states. • Solutions based on unpolarized cross sections alone have ambiguities; demonstrates the need for polarization measurements.
A. Sarantsev et al.,C. Bennhold, et al.,
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N* candidate at 1720 MeV in pπ+π- ?
electroproduction
W(GeV)
0
5
10
15
20
25
30
1.4 1.5 1.6 1.7 1.8 1.9 2 2.1
no 3/2+ (1720)full
M. Ripani et al, Phys.Rev.Lett. 91, 2003
photoproduction
W(GeV)
Background
Resonances
Interference
full calculation
no 3/2+
CLAS
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Nuclear Short Range Correlations
Rohe et al. PRL 93, 182501 (04) Egiyan et al, PRL, (06)
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Lattice QCD
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Opportunities12 GeV upgradeEICInternational CollaborationTheory
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Proposed EIC DesignsProposed EIC DesignseRHIC
L = 2.6x1033 cm-2s-1
Ecm = 140 GeV
Luminosities are for e-p collisions
LHeCL = 1.1x1033 cm-2s-1
Ecm = 1.4 TeV
ELICL = 7.7x1034 cm-2s-1
Ecm = 65 GeV
L = 0.47x1033 cm-2s-1
Ecm = 100 GeV
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Extracting d-bar/-ubar From Drell-Yan Scattering (E866/E906)
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International opportunities
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Facility for Antiproton and Ion Research
Walter F. Henning – GSI Darmstadt & University of FrankfurtDNP-APS Town Meeting, Rutgers University, Jan 12-14, 2007
Darmstadt ---- Helmholtz Centre for Ion Research
• (Very) Brief Description of the Facility
• Experimental Program(Strong Interaction Physics – QCD)
• (Very) Brief Description of the Facility
• Experimental Program(Strong Interaction Physics – QCD)
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High Energy Storage Ring, HESRHigh Energy Storage Ring, HESR
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PANDA Physics ProgramPANDA Physics Program
Charmonium spectroscopy
Exotics: charmed hybrids & heavy glueballs Time-like
form factors
Medium modifications
of charmed mesons
Hard exclusiveprocesses
CP-violation(D & Λ - sector)
Hypernuclei
Drell-Yanprocesses
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Recommendations1. Our highest priority is the timely completion of
the 12 GeV Upgrade of CEBAF and the start of its exciting research program.
2. It is imperative that funding be provided to make effective use of our major research facilities, which include operations of CEBAF, RHIC-SPIN, and TUNL-HIGS. We recommend increased federal investment in both people and equipment at our universities to support science and education activities associated with these facilities.
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Recommendations (continue)3. Substantially increased support for nuclear
theory is critical to achieving the short and long term scientific goals of the US nuclear physics program. In implementing the recommendations of the 2003 NSAC Report on Nuclear Theory, it is particularly important to focus on recruiting, nurturing and supporting young theorists.
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Recommendations (continue)4. A high luminosity Electron-Ion Collider (EIC)
facility is the highest priority of the QCD community for new construction after the JLab12 GeV and RHIC II luminosity upgrades.
5. We strongly support the recommendations of the workshop on Education and Public Outreach in nuclear sciences.
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Outline of the whitepaperExecutive Summary
BackgroundRecommendationsPhysics cases for recommendations
Progress since large long-range planHadron physics at short distanceHadron physics at long distanceNuclear Physics at short distanceHadron spectroscopyNuclear theory
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Outline of the whitepaperPhysics Program for Immediate Future
Jlab 6 GeV ProgramRHIC spin physicsOther facilities
Outstanding Opportunities in FutureJlab 12 GeV upgradeElectron-ion colliderInternational opportunitiesHadron physics theoryEducation and outreach