Elliptic flow of thermal dileptons in event-by-event hydrodynamic simulation
Elliptic flow of thermal dileptons in event-by-event hydrodynamic simulation
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DOI：
10.1103/physrevc.89.064902
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发表时间：
2014-04
影响因子：
3.1
通讯作者：
Hao Xu;L. Pang;Qun Wang
中科院分区：
文献类型：
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作者：
Hao Xu;L. Pang;Qun Wang
在(2+1)维逐个事件流体动力学模型下研究了Au+Au碰撞的热双电子椭圆流.起伏初始条件由蒙特卡罗Glauber模型给出。在逐个事件的计算中，我们发现双轻子发射角和带电强子的事件面角之间的相关性相当弱。利用双轻子在特定不变质量M处的事件平面角，在双轻子椭圆流中观察到强烈的涨落效应。双轻子事件平面角与带电强子事件平面角之间的相关性随着$M的减小而变得更强。这为几何形变效应和相对论重离子碰撞中起伏的“热点”效应之间的相互作用提供了一个可能的量度。
The elliptic flows of thermal di-electrons are investigated within a (2+1)-dimension event-by-event hydrodynamic model for Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV. The fluctuating initial conditions are given by the Monte Carlo Glauber model. We find in our event-by-event calculation rather weak correlation between the dilepton emission angles and the event plane angles of charged hadrons. We observe strong fluctuation effects in dilepton elliptic flows when using the event plane angles of dileptons at specific invariant mass $M$. The correlation between the dilepton event plane angle and charged hadron one becomes stronger with decreasing $M$. This provides a possible measure of the interplay between the effect of geometric deformation and that of fluctuating "hot spots" in relativistic heavy ion collisions.