Bulletin of the American Physical Society
2007 Annual Meeting of the Division of Nuclear Physics
Volume 52, Number 10
Wednesday–Saturday, October 10–13, 2007; Newport News, Virginia
Session 1WB: Workshop on Hard Scattering Processes and 3D Parton Distributions I |
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Chair: Latifa Eloudhiri, Jefferson Lab Room: Newport News Marriott at City Center Pearl Salon II/III |
Wednesday, October 10, 2007 9:00AM - 9:05AM |
1WB.00001: WELCOME/INTRO
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Wednesday, October 10, 2007 9:05AM - 9:55AM |
1WB.00002: Hard Exclusive Processes and GPDs Invited Speaker: Applications of perturbative QCD to deeply virtual Compton scattering and hard exclusive electroproduction processes require a generalization of the usual parton distributions for the case when long-distance information is accumulated in nondiagonal matrix elements of quark and gluon light-cone operators. I describe two types of generalized parton distributions, nonperturbative functions parametrizing such matrix elements: double distributions and off-forward parton distributions. I discuss their general properties, relation to the usual parton densities and form factors, evolution equations for both types of generalized parton distributions (GPD), models for GPDs, their applications in virtual and real Compton scattering, and recent achievements in the studies of GPDs. [Preview Abstract] |
Wednesday, October 10, 2007 9:55AM - 10:30AM |
1WB.00003: Spin Orbit Correlations Invited Speaker: I discuss the physical interpretation for generalized parton distributions (GPDs) with special focus on those GPDs that describe parton asymmetries in impact parameter space. The chirally even GPD $E(x,0,-{\bf \Delta}_\perp^2)$ describes the transverse deformation of the distribution of unpolarized quarks in a transversely polarized nucleon. In combination with an attractive final state interaction (FSI) this deformation can explain the Sivers effect in SIDIS. The chirally odd GPD $\bar{E}_T(x,0,-{\bf \Delta}_\perp^2)$ describes the deformation of the distribution of transversely polarized quarks in an unpolarized target. I will explain the physics associated with the sign of $\bar{E}_T$ and its implications for measurements of the Boer-Mulders function. [Preview Abstract] |
Wednesday, October 10, 2007 10:30AM - 11:00AM |
1WB.00004: COFFEE BREAK
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Wednesday, October 10, 2007 11:00AM - 11:35AM |
1WB.00005: TMD Studies at JLab Invited Speaker: In recent years parton distributions, describing longitudinal momentum, helicity and transversity distributions of quarks and gluons, have been generalized to account also for transverse momentum distributions of partons, providing important information on the spin-orbit correlations of partons in the nucleon. Great progress has been made since then in measurements of different Single Spin Asymmetries (SSAs) in semi-inclusive processes providing access to Transverse Momentum Dependent (TMD) parton distributions. Different facilities world-wide including HERMES at HERA, CLAS and Hall-A at JLab and COMPASS at CERN have measurements of semi-inclusive processes as one of their main focuses of research. TMD studies are also becoming an important part of future Drell-Yan experiments at JPARC and GSI. SSA measurements performed at HERMES, COMPASS and CLAS with polarized beams and targets provide access to different combinations of TMDs allowing the separation of different contributions from global analysis of the data. In addition, measurements of spin-orbit correlations with different pseudoscalar mesons in a wide kinematical range provide sensitivity to flavor dependence of TMDs. In this talk we present an overview of the latest developments in studies of TMDs at JLab and discuss newly released results, ongoing activities, as well as planned near term and future measurements. [Preview Abstract] |
Wednesday, October 10, 2007 11:35AM - 12:10PM |
1WB.00006: Generalized Parton Distribution studies at Jefferson Lab Invited Speaker: After about 10 years of strong interest for Generalized Parton Distributions (GPD) come the first significant results from several dedicated experiments from Jefferson Lab. Most of them used the golden Deeply Virtual Compton Scattering (DVCS) process in order to access the GPDs but new and interesting results are also available in the deep electroproduction of mesons. I will give an overview of these measurements, with particular focus on the new results from Hall A and B, and try to paint an overall picture of how well we understand all these new data in the GPD framework. The summary will include an outlook on the next generation of experiments which are already planned at Jefferson Lab with 6 GeV beam, but also after the 12 GeV upgrade. [Preview Abstract] |
Wednesday, October 10, 2007 12:10PM - 1:30PM |
1WB.00007: LUNCH
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