重离子碰撞对QCD物质的若干检验  

Some important test to the QCD matter with 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,河北石家庄050031

出　　处：《云南大学学报（自然科学版）》2015年第1期73-77,共5页Journal of Yunnan University(Natural Sciences Edition)

基　　金：国家自然科学基金(10575028);河北省教育厅课题(2011126)

摘　　要：采用重新拟合的σJ/ψN数据计算核吸收效应,并结合能量损失以及核遮蔽效应因子.研究了E866、RHIC和HERA上J/ψ粒子产生中微分截面比R的xF(或y)分布,结果与最新的实验数据进行了对比.结论表明:所选用的介质效应模型能较好地再现实验数据,体现冷核效应的幅度,尤其是RHIC的正快度区域(y>0)及HERA的负xF区域.文末还给出了对LHC上产值数据的预言.对冷核介质效应的研究,能协助甄别热核反应中的产值抑制是否预言中夸克-胶子等离子体形成的标志,从而有助于对QCD物质特征的检验.By applying a new fitting parameter σJ/ψN, we＇ve calculated the differential cross section ratio R of J/ψ in high energy p-A and p-p collisions with three different nuclear medium effects.The plots of R vs.x_F（y） calculated with selected nuclear effect models have been presented under E866, HERA, RHIC and LHC energy. By a comparison with the experimental data published recently, we＇ve found that the results can reproduce the trend and magnitude of data,especially at the positive rapidity of RHIC and the negative of x_F HERA.Our conclu- sion is helpful to identify the difference between the sign of quark-gluon formation and production suppression caused by cold nuclear effects,which is also an important test to the QCD matter in heavy ion collisions.

关 键 词：量子色动力学 核介质效应 能量损失效应 核吸收效应 核遮蔽效应 

分 类 号：O571.21[理学—粒子物理与原子核物理]