核Drell-Yan过程与部分子分布的不均匀性  

Nuclear Drell-Yan Process and Spatial Dependence of Parton Distribution Functions

作　　者：刘植凤[1] 段春贵[2] 苗文丹[1] 谢革英[3] 

机构地区：[1]石家庄经济学院地动所,河北石家庄050000 [2]河北师范大学物理科学与信息工程学院,河北石家庄050016 [3]河北建筑工程学院数理系,河北张家口075000

出　　处：《河北师范大学学报（自然科学版）》2007年第1期50-55,共6页Journal of Hebei Normal University：Natural Science

基　　金：国家自然科学基金(10575028)

摘　　要：通过p A碰撞的核Drell Yan过程研究了核遮蔽效应及其空间相关性.对末态轻子对的观测反映了相互作用点的情况.计算了能量为800 GeV的质子打击Ca,W,Au核的Drell Yan过程与p p碰撞Drell Yan过程的微分截面比.研究发现,在考虑部分子分布的空间依赖性后,核Drell Yan的截面会有显著变化.计算结果与未来精确测量p A碰撞核Drell Yan过程的实验数据比较,能够定量地验证部分子分布函数的空间依赖性.The nuclear shadowing effect and its position dependence are studied by the p-A Drell-Yan process. The nuclear Drell-Yan process can be used to study the spatial dependence of parton distribution functions. The dileptons produced in Drell-Yan process don＇t interact with other partons in the nuclear. Therefore,the final-states dileptons can infer the information of local partons. Considering the spatial dependence of parton distribution functions, the p-A Drell-Yan cross-section can be written as follows. With two kinds of spatial dependent shadowing parameterizations given in literature： the Drell-Yan cross-section ratios for an 800 GeV proton beam incident on p, Ca, W and Au are calculated. It is found that, considering the spatial dependence of parton distribution functions, the cross-section of nuclear Drell-Yan process changes significantly. By Comparing our result with the future precise data measured in Drell-Yan process, the spatial dependent parton distribution functions can be examined.

关 键 词：核遮蔽效应因子 核DRELL-YAN过程 部分子分布的空间依赖性 

分 类 号：O571.21[理学—粒子物理与原子核物理]