Drell-Yan过程中的核遮蔽效应及其空间相关性  

The Nuclear Shadowing Effect in Drell-Yan Process and its Spatial Dependence

作　　者：刘植凤[1] 

机构地区：[1]石家庄经济学院地球动力研究所,石家庄050000

出　　处：《石家庄学院学报》2006年第6期26-31,共6页Journal of Shijiazhuang University

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.为获得核内部分子分布的空间位置,简单介绍了用实验可测值横动能来推算空间量碰撞参数的方法.利用文献中给出的空间依赖的核遮蔽因子,计算了能量为800 GeV的质子打击Au核的Drell-Yan过程与p-p碰撞Drell-Yan过程的微分截面比,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的实验数据比较,能定量验证部分子分布函数的空间依赖性.In this paper,the nuclear shadowing effect and its position dependence is studied with the p-A Drell-Yan process. To study the pardons＇ spatial dependence, this paper presents a method to induce the collision parameter with traverse energy which could be measured in the experiment. With a kind of spatial dependent shadowing parameterizations given in hterature,we calculate the Drell -Yan cross-section ratios for an 800GeV proton beam incident on p and Au. It is found that,considering the spatial dependence of parton distribution functions,the cross-section of nuclear Drell-Yan process changes significantly. 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 碰撞参数 部分子分布的空间依赖性 

分 类 号：O571.2[理学—粒子物理与原子核物理]