标题： 夸克胶子等离子体中的J/ψ粒子 显示英文标题

标题： Charmonium in Hot Medium

摘要： 我们通过建立一个框架来研究重离子碰撞产生的热介质中的J/ψ粒子产生，其中介质中的J/ψ粒子性质由热格点QCD（lQCD）约束，并随后被引入到动力学方法中。 采用玻尔兹曼输运方程来描述J/ψ粒子相空间分布的时间演化，损失项和增益项分别对应J/ψ粒子的解离和再生（来自底夸克）。 计算了J/ψ粒子解离率的动量依赖性。 发现介质中的J/ψ粒子再生的主要过程是一个3对2的过程。 评估了从不同输入底夸克动量谱得到的再生率。 在快速度相关的总产额和横向动量（$p_t$）谱方面，将CERN-SPS和BNL-RHIC的$J/\psi$粒子产生实验数据与我们的数值结果进行了比较。 在当前从（解释）lQCD数据和输入底夸克谱中的不确定性范围内，SPS和RHIC（对于中间和前向快速度）的$J/\psi$粒子产率的中心度依赖性得到了合理再现。 $J/\psi$ $p_t$ 数据被显示具有区分介质中J/ψ粒子性质的能力，这取决于对lQCD结果的不同解释。 显示英文摘要

摘要： We investigate charmonium production in the hot medium created by heavy-ion collisions by setting up a framework in which in-medium charmonium properties are constrained by thermal lattice QCD (lQCD) and subsequently implemented into kinetic approaches. A Boltzmann transport equation is employed to describe the time evolution of the charmonium phase space distribution with the loss and gain term accounting for charmonium dissociation and regeneration (from charm quarks), respectively. The momentum dependence of the charmonium dissociation rate is worked out. The dominant process for in-medium charmonium regeneration is found to be a 3-to-2 process. Its corresponding regeneration rates from different input charm-quark momentum spectra are evaluated. Experimental data on $J/\psi$ production at CERN-SPS and BNL-RHIC are compared with our numerical results in terms of both rapidity-dependent inclusive yields and transverse momentum ($p_t$) spectra. Within current uncertainties from (interpreting) lQCD data and from input charm-quark spectra the centrality dependence of $J/\psi$ production at SPS and RHIC (for both mid- and forward rapidity) is reasonably well reproduced. The $J/\psi$ $p_t$ data are shown to have a discriminating power for in-medium charmonium properties as inferred from different interpretations of lQCD results.