高能核-核碰撞Drell-Yan过程K因子常数性的研究  

A Study on K-Factor′s Constant for Drell-Yan Process in High Energy Nucleus-Nucleus Collision

作　　者：侯召宇[1] 郑乔[2] 张本爱[3] 

机构地区：[1]石家庄师范专科学校物理系,石家庄050801 [2]石家庄铁道学院数理部,石家庄050043 [3]中国工程物理研究院北京研究生部,北京100088

出　　处：《高能物理与核物理》2002年第4期364-370,共7页High Energy Physics and Nuclear Physics

基　　金：中国工程物理研究院博士基金资助~~

摘　　要：在高能核 -核碰撞Drell Yan过程考虑湮没项和康普顿散射项的基础上 ,利用双重Q2 重标度模型 ,分别计算了碳、钙、铁、锡与其自身的核 -核碰撞 .结果表明 ,对于不同的x1值 ,K因子随x2 的变化很不相同 ;同时 ,K因子变化的幅度是随核素A不同而发生微弱变化的 ,在特定的x1,x2 取值有限范围内它不能近似取为常数 .The double Q 2-rescaling model is used to calculate the variation of K-factor with x 2 when the nucleus A-nucleus A collision (for example, C, Ca, Fe, Sn) occurs at different values of x 1, where x 1 and x 2 are momentum fraction variables. In this calculation, the contributions of annihilations and Compton scattering have been taken into account in the Drell-Yan process. The numerical results show that the plots of K-factor versus x 2 are somewhat dependent on the values of x 1 and that K-factor could not be regarded as a constant because it changes with A-nucleus to some extent. These results can be used to test the validity of the nucleus model and the adaptability of QCD theory.

关 键 词：高能核-核碰撞 DRELL-YAN过程 K因子 双重Q^2重标度模型 常数性 QCD 量子色动力学 

分 类 号：O572.243[理学—粒子物理与原子核物理]