Bulletin of the American Physical Society
2006 Division of Nuclear Physics Annual Meeting
Wednesday–Saturday, October 25–28, 2006; Nashville, Tennessee
Session CA: Exploring the Spin Structure of the Nucleon |
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Sponsoring Units: DNP Chair: Kees de Jager, Thomas Jefferson National Accelerator Facility Room: Gaylord Opryland Tennessee C |
Friday, October 27, 2006 9:00AM - 9:36AM |
CA.00001: The Theory of the Nucleon Spin Invited Speaker: \noindent The exploration of the spin of the proton and its relation to the angular momenta of the quark and gluon constituents continues to be a classic topic of nuclear physics. We give a synopsis of our present understanding, main theoretical concepts, and recent developments of the field. We address the most compelling questions and their theoretical background such as the role of the gluon polarization, the understanding of single-spin asymmetries in electron-proton and proton-proton collisions, or the transition to the low-$Q^2$ region. [Preview Abstract] |
Friday, October 27, 2006 9:36AM - 10:12AM |
CA.00002: Status and prospects for determining gluon polarization Invited Speaker: Deep inelastic scattering of polarized electrons and muons from polarized proton, deuterium and 3He targets have found that the measured polarization of quarks and antiquarks cannot fully account for the intrinsic spin of the proton. This leaves polarization of gluons and orbital motion of the quark, antiquark and/or gluon constituents as important sources of the intrinsic spin of the proton. This talk will review the present status of experiments conducted by HERMES, COMPASS and at RHIC that aim to determine the polarization of gluons within spin polarized protons. Prospects for further experiments sensitive to gluon polarization by the study of particle production in longtudinally polarized proton collisions at RHIC will also be discussed. [Preview Abstract] |
Friday, October 27, 2006 10:12AM - 10:48AM |
CA.00003: New Results on single spin asymmetries measured in DIS and polarised pp-scattering Invited Speaker: Azimuthal single spin asymmetries (SSA) in semi inclusive deep inelastic scattering (SIDIS) and polarized pp-scattering provide a tool to access transversity, the distribution of transversely polarized quarks in a transversely polarized nucleon. In addition the Sivers mechanism, the relation between intrinsic transverse quark momentum and the transverse momentum of the final hadron, can give rise to a nonzero SSA. For both the Collins and Sivers mechanism azimuthal moments for different hadronic final states are extracted from the COMPASS, HERMES and JLAB data taken with a transversely polarized targets. The latest results will also be presented from measurements of SSA in polarised pp-scattering from the RHIC experiments BRAHMS, PHENIX and STAR. [Preview Abstract] |
Friday, October 27, 2006 10:48AM - 11:24AM |
CA.00004: New results on nucleon spin structure from Jefferson Lab Invited Speaker: In this talk, we will present the Jefferson Lab (JLab) experimental program on nucleon spin structure. Results from new experiments in JLab's Hall A, B and C, with improved statistical and systematical uncertainties, are becoming available. They complement the results of a first round of experiments that ran in JLab Hall A and B in 1998 by extending the $Q^2$ and Bjorken-$x$ coverages both toward lower and higher limits. The new inclusive results allow us to study the behavior of quark distribution functions at large $x$, to study the transition from the hadronic to quark-gluon descriptions of the nucleon, to shed light on quark-hadron duality, to measure higher twist effects and to check the validity of Chiral Perturbation calculations. They also provide convenient benchmark measurements for lattice QCD calculations. After placing the experiments in their physics context, we will describe their experimental setup and present their results. We will conclude on future measurements with the 12 GeV upgrade of JLab. [Preview Abstract] |
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