改进的核密度模型与强子-核Drell-Yan过程中的核效应

Improved nuclear density model and the nuclear effect in P-A Drell-Yan process

提出了改进的核密度模型,用唯象的方法找到了束缚核子内价夸克和海夸克的核效应的参数公式,其中利用了核密度与原子核的平均结合能之间的联系.利用该模型所得到的束缚核子内部分子分布函数,对强子与核的Drell_Yan过程的核效应给出了满意的解释,深化了对原子核内夸克分布受核效应影响的认识.

In this paper we present an improved nuclear density model. We have found the nuclear effect parameters＇ formula R^AV （ x, Q^2 ） and R^AS（ x, Q^2 ） for the valence quark distribution and sea quark distribution in the nucleus, in which we have used the relation between the nuclear density and the mean binding energy in nucleus. By using the model, we can well explain the experimental data of the of Drell-Yan process in P-A.