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 2WB: Workshop on Hard Scattering Processes and 3D Parton Distributions II |
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Chair: Peter Bosted, Jefferson Lab Room: Newport News Marriott at City Center Pearl Salon II/III |
Wednesday, October 10, 2007 2:00PM - 2:35PM |
2WB.00001: TMD and GPD Studies at HERMES Invited Speaker: In the last few years the HERMES experiment has taken dedicated data for studies of TMD-PDFs (Transverse Momentum Dependent Parton Distribution Functions) and GPDs (Generalized Parton Distributions). The data taken on a transversely polarized hydrogen target (2002-2005) allow, e.g., for studies of the Sivers and Collins mechanisms via measurements of azimuthal single-spin asymmetries in the semi-inclusive production of hadrons. A preliminary result for pions with much higher statistical significance than the published result and a measurement for kaons will be presented. In the last two years data was taken with a newly installed detector in the target region, which allows for the detection of the recoiling proton in exclusive processes used to study GPDs. While the analysis of this latest data set is ongoing, exclusive processes for earlier data sets have been identified using, e.g., missing mass techniques. Results from the exclusive production of pseudoscalar- and vector mesons and real photons (DVCS) will be shown, whereby especially in the case of DVCS various asymmetries on different targets and with respect to the beam spin, beam charge and longitudinal- and transverse target spin have been measured. Of particular interest are the asymmetries on the transversely polarized hydrogen target which led to a first attempt for a model dependent extraction of the orbital angular momentum of quarks in the nucleon. [Preview Abstract] |
Wednesday, October 10, 2007 2:35PM - 3:10PM |
2WB.00002: Experimental Studies at RHIC Invited Speaker: |
Wednesday, October 10, 2007 3:10PM - 3:30PM |
2WB.00003: COFFEE BREAK
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Wednesday, October 10, 2007 3:30PM - 4:05PM |
2WB.00004: TMDs and GPDs ath COMPASS Invited Speaker: |
Wednesday, October 10, 2007 4:05PM - 4:40PM |
2WB.00005: Generalized Parton Distributions on the Lattice Invited Speaker: I review recent results on moments of Generalized Parton Distribution functions (GPDs) from Lattice QCD. In particular, I discuss the methodology of lattice calculations, and how various systematic errors arising in these calculations are controled. I conclude with an overview of the roadmap towards precision non-perturbative determination of moments of GPDs, and discuss the potential impact to the extraction of GPDs form experiment. [Preview Abstract] |
Wednesday, October 10, 2007 4:40PM - 5:15PM |
2WB.00006: 12 GeV Upgrade Jefferson Lab Invited Speaker: I will discuss the program and opportunities to measure Generalized Partons Distributions (GPDs) at Jefferson Lab with the 12 GeV upgrade of the CEBAF accelerator. At the energy-doubled CEBAF the increased kinematics coverage will allow probing these new distributions functions in the entire valence quark regime. The experimental equipment planned for these measurements will be discussed as well. [Preview Abstract] |
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