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

作　　者：段春贵 刘娜 

机构地区：[1]Department of Physics,Hebei Normal University [2]Hebei Advanced Thin Films Laboratory [3]CCAST(World Laboratory),P.O.Box 8730 [4]College of Mathematics and Physics,Shijiazhuang University of Economics

出　　处：《Chinese Physics C》2009年第6期411-414,共4页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China(10575028);Natural Science Foundation of Hebei Province(A2008000137)

摘　　要：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-Yan 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.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-Yan 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.

关 键 词：DRELL-YAN energy loss nuclear sea quark distribution 

分 类 号：O572.33[理学—粒子物理与原子核物理]