Bulletin of the American Physical Society
3rd Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 54, Number 10
Tuesday–Saturday, October 13–17, 2009; Waikoloa, Hawaii
Session LA: Spin Structure of the Nucleon |
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Chair: Naohito Saito, KEK Room: Kona 5 |
Saturday, October 17, 2009 2:00PM - 2:45PM |
LA.00001: Update on the spin structure of the nucleon Invited Speaker: In this talk, I review some of recent progress in understanding the spin structure of the nucleon. I will comment on some of the theoretical activities and experimental data as well. [Preview Abstract] |
Saturday, October 17, 2009 2:45PM - 3:30PM |
LA.00002: Nucleon structure from 2+1 flavor lattice QCD Invited Speaker: This talk gives a review of the recent lattice results obtained on the coarse RIKEN-BNL-Columbia (RBC) and UKQCD joint dynamical (2+1)-flavor domain-wall fermions (DWF) ensembles, where the simulated strange quark mass is close to its physical value, and the up and down quark masses are down to about 1/7 the strange quark mass ($M_{\pi}$= 330 MeV). Topics to be covered include iso-vector nucleon form factors and low moments of isovector structure functions of the nucleon, which are relevant for theoretical understanding of nucleon structure. Unresolved issues and future directions in lattice QCD will be discussed. [Preview Abstract] |
Saturday, October 17, 2009 3:30PM - 4:15PM |
LA.00003: RHIC-Spin: Results and Outlook Invited Speaker: Contribution of the gluon spin ($\Delta G$) to the proton spin 1/2 has been investigated as the first goal of spin physics at RHIC. Polarized proton collision experiments at a collision energy 200 GeV started in 2001. The PHENIX and STAR experiments have investigated the $\Delta G$ by measuring a longitudinal-spin asymmetries of neutral pion and jet produced in longitudinally polarized proton collisions. Experimental results from data taken in 2006 showed that these asymmetries are very small and they strongly restrict $\Delta G$ in the theoretical calculations based on perturbative QCD. From 2009, polarized proton collisions at a collision energy 500 GeV started and we investigate flavor-sorted contribution of the quark spin to the proton spin with weak-boson production. The final remaining piece of information to understand the proton spin is orbital-angular momenta of quarks and gluons inside the proton. Correlation between momentum-distribution of quarks and gluons inside the proton and their spin direction in transversely-polarized proton collisions will be investigated to understand the spin structure of the proton including the orbital-angular momentum. [Preview Abstract] |
Saturday, October 17, 2009 4:15PM - 5:00PM |
LA.00004: The Nucleon Spin Program at Jefferson Lab Invited Speaker: Spin structure of the nucleon has been one of the key research topics in nuclear science during the past three decades. Recent precision spin structure data from Jefferson Lab have significantly advanced our knowledge of nucleon structure in the valence quark (high-$x$) region and improved our understanding of higher-twist effects, spin sum rules, and quark-hadron duality. First, results of spin sum rules and polarizabilities in the low to intermediate $Q^2$ region will be presented and compared with theoretical calculations such as those based on Chiral Perturbation Theory (ChPT). Next, precision measurements of the spin asymmetry, $A_1$, in the high-$x$ region will be presented. They provide crucial input for global fits of polarized parton distribution functions. Finally, plans for the nucleon spin program at the upgraded 12 GeV JLab will be presented. [Preview Abstract] |
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