Bulletin of the American Physical Society
2007 APS April Meeting
Volume 52, Number 3
Saturday–Tuesday, April 14–17, 2007; Jacksonville, Florida
Session J2: Hadron Physics |
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Sponsoring Units: GHP Chair: Curtis A. Meyer, Carnegie Mellon University Room: Hyatt Regency Jacksonville Riverfront Grand 1 |
Sunday, April 15, 2007 10:30AM - 11:06AM |
J2.00001: The Spin of the Nucleon--Highlights from HERMES Invited Speaker: The question after the individual parton (quarks and gluons) contributions to the spin of the nucleon is even after 20 years of experimental efforts not yet solved. After several very precise measurements in polarized deep inelastic scattering it is clear, that the spin of the nucleon can not be explained by the contribution of the quarks alone. This is affirmed by the newest results from HERMES on the inclusive spin structure function g1 and on the individual contributions from the different quark flavors from semi-inclusive deep inelastic scattering data. Recently HERMES has started to measure the gluon polarization by isolating the photon gluon fusion process in semi-inclusive deep inelastic scattering; latest results on the contribution of the gluons to the nucleon spin will be discussed. The clear experimental evidence of exclusive reactions, especially DVCS, allows in the formalism of generalized parton distributions the study of an other component of the nucleon spin the orbital angular momentum. The most recent results on indications of the size of the orbital angular momentum of quarks will be presented. To complete the picture on the spin-structure of the nucleon it is indispensable to measure the till now completely unknown spin structure function called transversity. Results from measurements with a transversely polarized hydrogen target give first insights to this quantity. [Preview Abstract] |
Sunday, April 15, 2007 11:06AM - 11:42AM |
J2.00002: Pion Form Factor: Present and Future Invited Speaker: The pion charge form factor, $F_{\pi}$, is of key interest in the study of the quark-gluon structure of hadrons. The valence structure of the pion $\langle q\bar{q}\rangle$ is relatively simple, so it is used as a test case for all models of hadronic structure. Experimentally, the measurement of the pion form factor poses special challenges. The technique utilizes a precision Rosenbluth separation of the $p(e,e'\pi^+)n$ reaction at low $-t$. $F_{\pi}$ is then extracted from the separated $\sigma_L$ cross sections with the aid of a model. Over the past several years, we have mounted two experiments at Jefferson Lab (JLab) to measure $F_{\pi}$ over the range of $Q^2=0.6$ to 2.45 GeV$^2$. These measurements are planned to be extended to higher $Q^2$ with the completion of the JLab 12 GeV upgrade. These data would challenge QCD-based calculations in the most rigorous manner. The recent JLab data will be presented and compared to a variety of model calculations, and the future outlook will be discussed. [Preview Abstract] |
Sunday, April 15, 2007 11:42AM - 12:18PM |
J2.00003: The Quark Gluon Plasma and the Perfect Fluid: Quantifying Degrees of Perfection Invited Speaker: The hot energy dense medium created in high energy heavy ion reactions has been described by many names, including a quark gluon plasma and a perfect fluid. In this presentation, we will give an overview of what these terms mean and what quantitatively has been learned about the relevant properties of the medium. [Preview Abstract] |
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