Non-equilibrium time evolution of higher order cumulants of conserved charges and event-by-event analysis
Non-equilibrium time evolution of higher order cumulants of conserved charges and event-by-event analysis
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DOI：
10.1016/j.physletb.2013.12.008
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发表时间：
2013-07
影响因子：
4.4
通讯作者：
M. Kitazawa;M. Asakawa;Hirosato Ono
中科院分区：
文献类型：
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作者：
M. Kitazawa;M. Asakawa;Hirosato Ono
利用扩散主方程研究了体积中守恒电荷的高阶累积量随时间的演化。将此结果应用于相对论重离子碰撞强子阶段非高斯涨落的扩散，表明如果强子化时的高阶累积量与平衡态强子阶段的值相比被抑制，则LHC能区净电荷的四阶累积量与最近在ALICE观测到的二阶累积量相比被抑制.强调了各种累积量对快度窗口依赖性的实验信息在研究相对论重离子碰撞中产生的热介质的动力学演化历史中的重要性。
We investigate the time evolution of higher order cumulants of conserved charges in a volume with the diffusion master equation. Applying the result to the diffusion of non-Gaussian fluctuations in the hadronic stage of relativistic heavy ion collisions, we show that the fourth-order cumulant of net-electric charge at LHC energy is suppressed compared with the recently observed second-order cumulant at ALICE, if the higher order cumulants at hadronization are suppressed compared with their values in the hadron phase in equilibrium. The significance of the experimental information on the rapidity window dependence of various cumulants in investigating the history of the dynamical evolution of the hot medium created in relativistic heavy ion collisions is emphasized.