Bulletin of the American Physical Society
2006 Division of Nuclear Physics Annual Meeting
Wednesday–Saturday, October 25–28, 2006; Nashville, Tennessee
Session 2WC: Pre-Meeting Workshop: Spin Structure of the Nucleon |
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Sponsoring Units: DNP Chair: Charles Maguire and Julia Velkovska, Vanderbilt University Room: Gaylord Opryland Bayou B |
Wednesday, October 25, 2006 3:30PM - 4:00PM |
2WC.00001: Theoretical Overview of Spin Physics Invited Speaker: In this talk, I will review recent theoretical developments on spin structure of nucleon, focus on the gluon helicity contribution to the proton spin, the three-dimensional imagine of proton (Generalized Parton Distributions), and transverse spin physics. [Preview Abstract] |
Wednesday, October 25, 2006 4:00PM - 4:30PM |
2WC.00002: Nucleon Spin Studies in the Valence Quark Region Invited Speaker: With a minimal contamination from the sea quarks and gluons the valence quark region provides a clean region to study the spin structure of the nucleon. Precision deep inelastic scattering measurements of $g_{1}$ and $g_{2 }$spin-dependent structure functions and their higher moments (integrals over $x)$ offer an opportunity for testing our grasp of this structure. The valence quark distributions offer a good testing ground for constituent quark models of the nucleon. The higher moments of the quark distributions dominated by their valence contribution provide some of the cleanest tests of QCD. However, these tests require precision measurement in the large $x$ region were cross sections fall rapidly. Last but not least, these distributions are a crucial input for calculating cross sections for hard processes in high-energy hadron-hadron colliders such as the LHC or the Fermilab Tevatron, in searches for the Higgs boson or for physics beyond the Standard Model. I shall discuss some of the recent precision results of the nucleon spin-dependent structure functions obtained in this region and their impact on our overall understanding of the nucleon spin structure. I'll finish with remarks on prospects of extending these studies in the future using the 12 GeV upgrade of CEBAF at Jefferson Lab. [Preview Abstract] |
Wednesday, October 25, 2006 4:30PM - 5:00PM |
2WC.00003: Spin Results from Hermes Invited Speaker: This abstract has not been submitted electronically yet. [Preview Abstract] |
Wednesday, October 25, 2006 5:00PM - 5:15PM |
2WC.00004: Break
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Wednesday, October 25, 2006 5:15PM - 5:45PM |
2WC.00005: Transverse Quark Spin Effects in SIDIS and Drell Yan Scattering Invited Speaker: The connection between quark orbital angular momentum and final state interactions for transversely polarized quarks in unpolarized hadrons suggests significant azimuthal asymmetries in pion production in semi-inclusive deep inelastic scattering (SIDIS) ($e\ p\rightarrow e^\prime \ X \ \pi$) as well as in di- lepton production in Drell Yan ($p\ \bar{p}\rightarrow \ell^+ \ \ell^- \ X$ and $\pi^-\ p\rightarrow \ell^+ \ \ell^- \ X$) scattering. When transverse momentum of the reaction, $P_{T}$ is on the order of or less than $\Lambda_{\rm qcd}$, that is $P_T\sim k_T$ where $k_T$ is intrinsic transverse quark momentum, these effects are characterized in term of naive time reversal odd (so called $T$-odd) transverse momentum dependent (TMD) parton distribution and fragmentation functions. At these moderate transverse momentum scales we estimate the size of the $\cos 2\phi$ azimuthal asymmetry in SIDIS and Drell Yan scattering in the parton spectator framework. In the former case we consider this so called ``Boer-Mulders'' effect for a proposed experiment at the upgraded CLAS-12 GeV detector at Jefferson LAB. In the latter case we consider this asymmetry for proton anti-proton collider, as well as $\pi$ nucleon fixed target experiments. We also consider competing contributions to these asymmetries from perturbative QCD (pQCD) contributions which emerge when $P_T \ > \ \Lambda_{\rm qcd}$. Evidence of a strong dependence on transverse momentum would indicate the presence of $T$-odd structures in {\em unpolarized} SIDIS and Drell Yan scattering, implying that transversity properties of the nucleon can be accessed without invoking beam or target polarization. [Preview Abstract] |
Wednesday, October 25, 2006 5:45PM - 6:15PM |
2WC.00006: Recent Spin Physics Results from PHENIX Invited Speaker: The performance of RHIC as a polarized proton collider has increased dramatically with every year of running. The polarized data taken by PHENIX in the 2005 and 2006 runs have made a variety of new analyses possible, with significant data sets available for both longitudinal and transverse spin physics. Measurements of the double-helicity asymmetry in the production of various particle species provide further constraints on the gluon polarization, and the data from transversely polarized collisions offer the opportunity for several exploratory measurements probing the transverse spin structure of the proton, still poorly understood. Latest results and the status of ongoing analyses will be discussed. [Preview Abstract] |
Wednesday, October 25, 2006 6:15PM - 6:45PM |
2WC.00007: Spin Results from STAR Invited Speaker: This abstract has not been submitted electronically yet. [Preview Abstract] |
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