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arXiv 1902.06989hep-phnucl-th
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超相对论重离子碰撞中色场随机涨落对$J/ψ$抑制的作用

The role of the stochastic color field fluctuations on $J/ψ$ suppression in ultra-relativistic heavy-ion collisions

Ashik Ikbal Sheikh, Zubayer Ahammed, M. G. Mustafa

摘要:

我们考虑了在超相对论性重离子碰撞中产生的夸克和胶子组成的热而密的退禁闭介质中,粲夸克在传播过程中的随机色场涨落以及碰撞和辐射能量损失的影响.这些涨落导致了传播中的粲夸克的能量增益。在($3+1$)-D相对论粘性流体力学描述的演化背景物质下,我们构造并求解了粲夸克的Langevin输运方程。考虑粲夸克的能量增益,计算了$J/ψ$的核修正因子$R_{AA}$。有趣的是,PHENIX合作组织在$\sqrt{s_{NN}} = 200$ GeV的$Au-Au$碰撞和ALICE和CMS合作组织在$\sqrt{s_{NN}} = 2.76$ TeV的$Pb-Pb$碰撞中对$J/ψ$抑制的实验测量,可以很好地描述这些场波动的影响,而不会引起再生现象。

英文摘要:

We consider the effect of the stochastic color field fluctuations in addition to the collisional as well as the radiative energy losses in the propagation of charm quarks in the hot and dense deconfined medium of quarks and gluons created in ultra-relativistic heavy-ion collisions. These fluctuations lead to energy gain of the propagating charm quarks. We construct and solve Langevin transport equations for charm quarks under the evolving background matter described by the ($3+1$)-D relativistic viscous hydrodynamics. Considering the energy gain of charm quarks, the nuclear modification factor $R_{AA}$ of $J/ψ$ is calculated. Interestingly, the experimental measurements for $J/ψ$ suppression in $Au-Au$ collisions at $\sqrt{s_{NN}} = 200$ GeV by PHENIX Collaboration and $Pb-Pb$ collisions at $\sqrt{s_{NN}} = 2.76$ TeV by ALICE and CMS Collaborations, can be nicely described with the effect of these field fluctuations without invoking the regeneration phenomena.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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