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HK: Fachverband Hadronen und Kerne
HK 70: Hadron Structure and Spectroscopy II
HK 70.5: Talk
Thursday, March 19, 2009, 18:00–18:15, H-ZO 30
Structure functions of nucleons and nuclei — •Wolfgang Bentz1, Ian Cloet2, Takuya Ito1, Anthony Thomas3, and Koichi Yazaki4 — 1Department of Physics, Tokai University, Kanagawa, Japan — 2Department of Physics, University of Washington, Seattle, USA — 3Jefferson Lab, Newport News, VA, USA — 4RIKEN, Wako-shi, Saitama, Japan
We use an effective chiral quark theory to calculate the quark distributions and structure functions of nucleons and nuclei. The description of the single nucleon is based on the Faddeev framework, and nuclear systems are described in the mean field approximation. Particular amphasis is put on the prediction of the polarized EMC effect in nuclei, and on applications to deep inelastic neutrino-nucleus scattering. Concerning the polarized EMC effect, we discuss the quenching of the quark spin sum in nuclei and its implications for the spin dependent nuclear structure functions, and present results for several nuclei where an experimental observation is feasible. Concerning the case of deep inelastic neutrino-nucleus scattering, we estimate the effect of medium modifications of the quark distribution functions on the measured cross sections, and discuss an interesting resolution of the so called NuTeV anomaly. Finally, we discuss extensions of our model to describe fragmentation functions for semi-inclusive processes. The connection between our effective quark model description and the jet model of Field and Feynman is discussed.