Drell-Yan nuclear modification due to nuclear effects of nPDFs and initial-state parton energy loss  

作　　者：Li-Hua Song Peng-Qi Wang Yin-Jie Zhang 宋丽华;王鹏棋;张印杰(College of Science,North China University of Science and Technology,Tangshan 063210,China;College of Physics Science and Technology,Hebei University,Baoding 071002,China)

机构地区：[1]College of Science,North China University of Science and Technology,Tangshan 063210,China [2]College of Physics Science and Technology,Hebei University,Baoding 071002,China

出　　处：《Chinese Physics C》2021年第4期33-40,共8页中国物理C（英文版）

基　　金：Supported partially by National Natural Science Foundation of China (11405043);Natural Science Foundation of Hebei Province (A2018209269);Science and Technology Foundation of Hebei Education Department (ZD2020104)。

摘　　要：By globally analyzing nuclear Drell-Yan data including all incident energies,the nuclear effects of nuclear parton distribution functions(nPDFs)and initial-state parton energy loss are investigated.Based on the Landau-Pomeranchuk-Migdal(LPM)regime,the calculations are carried out by means of analytic parametrizations of quenching weights derived from the Baier-Dokshitzer-Mueller-Peigné-Schiff(BDMPS)formalism and using the new EPPS16 nPDFs.It is found that the results are in good agreement with the data and the role of the energy loss effect in the suppression of Drell-Yan ratios is prominent,especially for low-mass Drell-Yan measurements.Thenuclear effects of nPDFs become more obvious with increasing nuclear mass number A,the same as the energy loss effect.By a global fit,the transport coefficient extracted is q=0.26±0.04 GeV^(2)/fm.In addition,to avoid diminishing the QCD NLO correction to the data form of Drell-Yan ratios,separate calculations of the Compton differentialcross section ratios RFe(W)/C(xF)at 120 GeV are performed,which provides a feasible way to better distinguish the gluon energy loss in Compton scattering.It is found that the role of the initial-state gluon energy loss in the suppression of Compton scattering ratios is not very important and disappears with the increase of xF.

关 键 词：energy loss parton distribution Drell-Yan process 

分 类 号：O571[理学—粒子物理与原子核物理]