J/ψ粒子产生中x_F<0范围内的能量损失  

Nuclear energy loss effect in production of J/ψ at x_F<0

作　　者：刘植凤[1] 谢革英[2] 刘娜[1] 

机构地区：[1]石家庄经济学院地球动力研究所,石家庄050031 [2]河北建筑工程学院数理系,河北张家口075000

出　　处：《华中师范大学学报（自然科学版）》2008年第3期368-371,共4页Journal of Central China Normal University：Natural Sciences

基　　金：国家自然科学基金项目(10575028)

摘　　要：根据色蒸发产生机制,应用三种不同的能量损失模型计算了RHIC和HERA能量下J/ψ粒子产生中的核依赖性,给出了不同模型下xF<0范围的α(xF)的xF分布,并与实验数据进行了对比.研究表明:选用相同的核遮蔽因子时,不同能量损失模型在xF<0范围内的计算结果存在很大差异,与实验数据的吻合程度也明显不同,这表明并非所有的模型在xF<0范围内都是适用的.In this paper we calculated the A dependence of J/ψb production under high energy with color evaporate model and three different energy loss models. The plots of a（xF） vs. xF calculated with different energy loss models at xF〈0 were presented under RHIC and HERA energy. By a comparison with the experimental data published recently, we find that the results calculated with same nuclear shadowing parameter and different energy loss models is much different, which indicated that not all of the energy loss models were suitable in the rang of xF〈0.

关 键 词：色蒸发模型 能量损失效应 核遮蔽效应 粲夸克偶素 

分 类 号：O571.21[理学—粒子物理与原子核物理]