高能碰撞轻子对产生的核Drell-Yan过程中的能量损失

Energy Loss Effect in High Energy Nuclear Drell-Yan Process with the Production of Lepton Pairs

核物质中的能量损失效应是不同于束缚核子部分子分布函数核效应的另外一种核效应,而核Drell-Yan过程是研究这种能量损失效应的最佳途径。用G.T.Garvey和T.C.Peng提出的处理能量损失的方法,采用EKS和HKM两套不同的束缚核子的部分子分布函数,分别计算了核Drell-Yan过程中的微分截面比,所得结果一方面验证了p-A碰撞中能量损失的存在,另一方面也说明了用来确定束缚核子部分子分布函数的参数中不应包括核Drell-Yan过程中的实验数据。

The paper discusses energy loss effect in nuclear matter, which is a nuclear effect, apart from the nuclear effect on the parton distribution as in deep-inelastic scattering process, that can be measured best in the high energy nuclear Drell-Yan process. By means of a clear idea of quark energy loss in the nuclear medium presented by G. T. Garvey and J. C. Peng and two sets of nuclear parton distribution functions （EKS ＆ HKM） ,we discuss the energy loss of partons in Drell-Yan process and present that the determination of nuclear parton distribution functions should not include Drell-Yan experimental data.