重离子碰撞J/ψ粒子产生中的核介质效应  

Nuclear medium effects of J/ψ production in heavy ion collisions

作　　者：刘植凤[1] 

机构地区：[1]石家庄经济学院地球动力研究所,石家庄050031

出　　处：《华中师范大学学报（自然科学版）》2008年第1期46-49,共4页Journal of Central China Normal University：Natural Sciences

基　　金：国家自然科学基金资助(10575028)

摘　　要：利用色八重态产生机制和不同的核介质效应模型,在RHIC-PHENIX和HERA-B的运动学范围内,计算了重离子碰撞中J/ψ粒子产生截面比的y分布,以及在xF<0范围内α(xF)的xF分布,并与最新公布的实验数据进行了对比,显示出不同的核介质效应模型对截面的影响相差很大.结论对于验证xF<0时核介质效应模型的适用性、研究夸克-胶子等离子体的形成标志具有重要意义.In this paper we estimate the influence of the shadowing effect and initial state parton energy loss in the quarkonium production at HEAR-B and RHIC-PHENIX. Having analyzed the y behavior of the cross section ratios and the xf behavior of the effective exponet a（xF） at xf 〈 0, we present a comparison with the experimental data published recently. Our conclusion indicated that the cross section distribution calculated with different nuclear medium models is much different. Our conclusion is of major importance in verifying the availability of different nuclear medium models at xF〈0 and in studying the formation of quarknium gluon plasma.

关 键 词：核介质效应 核遮蔽效应 能量损失效应 色八重态产生模型 

分 类 号：O571.21[理学—粒子物理与原子核物理]