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arXiv 1202.3291nucl-thhep-ph
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$J/ψ$抑制和QCD phase diagram

$J/ψ$ suppression and QCD phase diagram

A. K. Chaudhuri, Partha Pratim Bhaduri

摘要:

通过分析$\snn$ =17.3 Pb+Pb和$\snn$ =200 GeV Au+Au碰撞中$J/ψ$抑制的中心性依赖关系,得到了QCD相图.假设在初始相互作用中产生的$J/ψ$在局部温度超过阈值温度时溶解。阈值温度取决于(局部)流体温度和重子化学势,它们是在某些假设下从实验确定的量(例如快度密度、净重子密度)中获得的。曲率参数为$κ\approx 0.018-0.23$的QCD临界线与实验数据$J/ψ$一致。$κ$是$\sim$ 3的因子,比格点量子色动力学计算的大。

英文摘要:

QCD phase diagram is obtained by analysing centrality dependence of $J/ψ$ suppression in $\snn$=17.3 Pb+Pb and $\snn$=200 GeV Au+Au collisions. $J/ψ$'s produced in initial interactions are assumed to dissolve if local temperature exceeds a threshold temperature. The threshold temperature depends on the (local) fluid temperature and baryonic chemical potential, which are obtained, under certain assumptions, from experimentally determined quantities e.g. rapidity density, net baryon density. QCD critical line with curvature parameter $κ\approx 0.018-0.23$ is consistent with experimental $J/ψ$ data. $κ$ is factor of $\sim$3 larger than in lattice QCD calculations.

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