LHC上QGP中Charmonium再生的pQCD方法
pQCD approach to Charmonium regeneration in QGP at the LHC
摘要：
分析了微扰QCD（pQCD）方法对大型强子对撞机（LHC）上$J/ψ$复合问题的适用性，计算了$c\bar{c}$复合形成$J/ψ$的复合截面随温度的变化.通过在$c\bar{c}$对之间采用依赖于温度的唯象势，得到了粲偶素波函数。粲偶素的形成时间随温度的变化也被应用于本工作中。建立了一组耦合速率方程，该方程考虑了夸克-胶子等离子体（QGP）介质中非关联$c\bar{c}$对的色屏蔽、胶子离解、碰撞阻尼和复合。最后的$J/ψ$抑制，从而确定为一个函数的中心性进行比较与ALICE实验数据在中间和向前的快度和CMS实验数据在中间快度从大型强子对撞机（LHC）在质心能量$\sqrt{s_{NN}} = 2.76$ TeV。保留字：颜色筛选，电离，胶子解离，碰撞阻尼，存活概率，pQCD，Charmonium PACS编号：12.38.Mh，12.38.Gc，25.75.Nq，24.10.Pa
英文摘要：
We analyze the applicability of perturbative QCD (pQCD) approach to the issue of $J/ψ$ recombination at the Large Hadron Collider (LHC), and calculate the recombination cross section for $c\bar{c}$ recombination to form $J/ψ$ as a function of temperature. The charmonium wavefunction is obtained by employing a temperature dependent phenomenological potential between the $c\bar{c}$ pair. The temperature dependent formation time of charmonium is also employed in the current work. A set of coupled rate equations is established which incorporates color screening, gluonic dissociation, collisional damping and recombination of uncorrelated $c\bar{c}$ pair in the quark-gluon plasma (QGP) medium. The final $J/ψ$ suppression, thus determined as a function of centrality is compared with the ALICE experimental data at both mid and forward rapidity and CMS experimental data at mid rapidity obtained from the Large Hadron Collider (LHC) at center of mass energy $\sqrt{s_{NN}} = 2.76$ TeV. Keywords : Color screening, Recombination, Gluonic dissociation, Collisional damping, Survival probability, pQCD, Charmonium PACS numbers : 12.38.Mh, 12.38.Gc, 25.75.Nq, 24.10.Pa
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