Influence of quark energy loss on extracting nuclear sea quark distribution from nuclear Drell-Yan experimental data

By means of two typical kinds of quark energy loss parametrization and the nuclear parton distribu-tions determined only with lepton-nuclear deep inelastic scattering experimental data, a leading order analysis is performed on the proton-induced Drell-Yau differential cross section ratios of tungsten versus deuterium as a function of the quark momentum fraction in the beam proton and target nuclei. It is found that the theoretical results with quark energy loss are in good agreement with the experimental data. The quark energy loss effect produces approximately 3% to 11% suppression on the Drell-Yan differential cross section ratios RW/D in the range 0.05 ≤ x2≤ 0.3. The application of nuclear Drell-Yan data with heavy targets is remarkably subject to difficulty in the constraint of the nuclear sea quark distribution.

作 者： DUAN Chun-Gui LIU Na   作者單位： DUAN Chun-Gui(Department of Physics, Hebei Normal University, Shijiazhuang 050016, China;Hebei Advanced Thin Films Laboratory, Shijiazhuang 050016, China;CCAST (World Laboratory), P. O. Box 8730, Beijing 100080, China)

LIU Na(Department of Physics, Hebei Normal University, Shijiazhuang 050016, China;College of Mathematics and Physics, Shijiazhuang University of Economics, Shijiazhuang 050031, China) 

刊 名： 中國物理C（英文版）  ISTIC 英文刊名： CHINESE PHYSICS　C  年，卷(期)： 2009 33(6)  分類號： O4  關(guān)鍵詞： Drell-Yan   energy loss   nuclear sea quark distribution  

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