C-C核碰撞Drell-Yan过程K因子的非常数性

The Nonconstant of the K-factor in the Drell Yan Process of the Nuclei C-C Collision

在 Drell-Yan过程中计入湮灭项和康普顿散射项的贡献 ,利用双重 Q2 -重标度模型 ,计算了碳核与碳核碰撞在给定不同的 x A1 值时 K因子随 x A2 的变化 .结果表明 ,对应不同的 x A1 值 ,K因子随 x A2 的变化曲线形状很不相同 .计算结果与实验对照可以检验所用核效应的模型及 QCD理论 .

In this paper,we have use the model of double Q 2 rescaling to caluclate the change of K factor with x A 2 change when the nuclei C C is in collision which have been given different x A 1 on the valence,and in this calculation we have considered the contributions of annihilations and Compton Scattering in the Drell Yan process.The results show that the curve of K factor with x A 2 is very different for different valence x A 1 .The calculating results are compared with exprimental data,it can not only test the model of its nuclear effect,but also the QCD theory.