Title: Internal Charmonium Evolution in the Quark-Gluon Plasma Show Chinese title

Title: 夸克-胶子等离子体中的内部粲偶素演化

Abstract: We employ a time-dependent Schr\"odinger equation to study the evolution of a $c\bar c$ dipole in a quark-gluon plasma (QGP). Medium effects on the heavy-quark potential in the QGP are found to significantly affect the timescales of the internal evolution of the dipole. Color-screening can enhance the overlap of the expanding wavepackage with excited states at high temperature, while it is reduced at lower temperatures where the dipole favors the formation of the charmonium ground state. We investigate the consequences of this mechanism on the double ratio of charmonium nuclear modification factors, $R_{AA}^{\psi(2S)}/R_{AA}^{J/\psi}$, in heavy-ion collisions. The impact of the transition mechanisms on this ratio turns out to be rather sensitive to the attractive strength of the potential, and to its temperature dependence. Show Chinese abstract

Abstract: 我们采用含时薛定谔方程来研究处于夸克胶子等离子体（QGP）中的一个$c\bar c$偶极子的演化过程。发现QGP中重夸克势的介质效应显著影响偶极子内部演化的时标。色屏蔽效应可以在高温下增强扩展波包与激发态的重叠，而在较低温度下则减弱，此时偶极子更倾向于形成正charmonium基态。我们进一步研究了这种机制对重离子碰撞中charmonium核修正因子双比值$R_{AA}^{\psi(2S)}/R_{AA}^{J/\psi}$的影响。这一比值对势的吸引力强度及其温度依赖性表现出相当敏感的响应。