相对论重离子碰撞中的重味产生

原子核物理评论 , 2012, 29(1): 1-13.

相对论重离子碰撞中的重味产生

1.清华大学物理系,北京,100084

2.清华大学物理系,北京,100084

基金项目: 国家自然科学基金资助项目(10575058,10735040,10975084,11079024) 国家重点基础研究发展计划(973计划)项目(2007CB815004)~~致谢感谢美国LBNL的许怒博士和清华大学物理系高能核物理组的严力、朱相雷、屈真、周凯、陈保义和李刚同学在研究工作中的讨论和帮助

关键词：离子碰撞 , QCD相变 , 重味压低

Heavy Flavor Production in Relativistic Heavy Ion Collisions

Keywords： heavy ion collision , QCD phase transitions , heavy flavor suppression

重味粒子是新的物质形态———夸克胶子等离子体的敏感探针。利用相对论流体力学描述夸克胶子等离子体的时空演化,采用输运方程模拟重味粒子在夸克胶子等离子体中的运动,既考虑重味粒子的热胶子离解,也通过细致平衡原理包含重味粒子在热密媒质中的重产生。正是由于离解与重产生之间的竞争以及竞争对于碰撞能量、横动量和快度的依赖性,自然解释了在RHIC能区的J/ψ疑难,预言了在LHC能区由于重产生取得主导地位,J/ψ的核修正因子在中心和半中心碰撞中将随着参与反应核子数的增大而升高,同时其平均横动量会受到强烈的压低。

Heavy quarkonium is a sensitive signature of the new state of matter-quark-gluon plasma produced in high energy nuclear collisions.We describe the space-time evolution of the quark-gluon plasma by relativistic hydrodynamic equations and the quarkonium motion by transport equation.We found that the competition between the gluon dissociation and regeneration can explain naturally the J/ψ puzzles at RHIC energy.We predict the increase of the nuclear modification factor in semi-central and central collisions and the related transverse momentum suppression at LHC energy.

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