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.
出处
《高能物理与核物理》
EI
CSCD
北大核心
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~~
