Atomic mass,Bjorken variable,and scale dependence of quark transport coefficient in Drell-Yan process for proton incident on nucleus  

作　　者：许卫杰 白天星 段春贵 Wei-Jie Xu;Tian-Xing Bai;Chun-Gui Duan(College of Physics and Hebei Advanced Thin Film Laboratory,Hebei Normal University,Shijiazhuang 050024,China;Hebei University of Environmental Engineering,Qinhuangdao 066102,China)

机构地区：[1]College of Physics and Hebei Advanced Thin Film Laboratory,Hebei Normal University,Shijiazhuang 050024,China [2]Hebei University of Environmental Engineering,Qinhuangdao 066102,China

出　　处：《Chinese Physics C》2023年第4期122-131,共10页中国物理C（英文版）

基　　金：Supported in part by the National Natural Science Foundation of China(11975090,11575052)。

摘　　要：By means of the nuclear parton distributions determined without the fixed-target Drell-Yan experimental data and the analytic expression of quenching weight based on the BDMPS formalism,next-to-leading order analyses were performed on the Drell-Yan differential cross section ratios from the Fermilab E906 and E866 collaborations.It was found that the results calculated only with the nuclear effects of the parton distribution were not in agreement with the E866 and E906 experimental data.The incoming parton energy loss effect cannot be ignored in the nuclear Drell-Yan reactions.The predicted results indicate that,with the quark transport coefficient as a constant,the suppression due to the target nuclear geometry effect is approximately 16.85%for the quark transport coefficient.It was shown that we should consider the target nuclear geometry effect in studying the Drell-Yan reaction on nuclear targets.On the basis of the Bjorken variable and scale dependence of the quark transport coefficient,the atomic mass dependence was incorporated.The quark transport coefficient was determined as a function of the atomic mass,Bjorken variablex_(2),and scale Q^(2)by the global fit of the experimental data.The determined constant factor q_(0)of the quark transport coefficient is 0.062±0.006 GeV^(2)/fm.It was found that the atomic mass dependence has a significant impact on the constant factor q_(0)in the quark transport coefficient in cold nuclear matter.

关 键 词：quark transport coefficient DRELL-YAN energy loss 

分 类 号：O572.2[理学—粒子物理与原子核物理]