In-medium effects on charmonium production in heavy-ion collisions.
In-medium effects on charmonium production in heavy-ion collisions.
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DOI：
10.1103/physrevlett.92.212301
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发表时间：
2003-06
影响因子：
8.6
通讯作者：
L. Grandchamp;R. Rapp;G. Brown
中科院分区：
文献类型：
--
作者：
L. Grandchamp;R. Rapp;G. Brown
在一个动力学理论框架内研究了重离子碰撞中碳素的产生，结合了最近的QCD晶格计算，结合了开放和隐藏魅力态的介质性质。在强子物质和夸克-胶子物质的相界上，不断减小的开启魅力阈值对碳原子态的平衡丰度有着重要的意义。J/psi共振态在跃迁温度以上的存活使得它们也可以在夸克-胶子等离子体中重现。包括化学和热非平衡的影响，我们将我们的模型结果与在CERN SPS和BNL RHIC能量下可用的实验数据进行了比较。特别是，可以解决早先在psi(‘)/psi比率中发现的差异。
Charmonium production in heavy-ion collisions is investigated within a kinetic theory framework incorporating in-medium properties of open- and hidden-charm states in line with recent QCD lattice calculations. A continuously decreasing open-charm threshold across the phase boundary of hadronic and quark-gluon matter is found to have important implications for the equilibrium abundance of charmonium states. The survival of J/psi resonance states above the transition temperature enables their recreation also in the quark-gluon plasma. Including effects of chemical and thermal off-equilibrium, we compare our model results to available experimental data at CERN SPS and BNL RHIC energies. In particular, earlier found discrepancies in the psi(')/psi ratio can be resolved.