"Table 202" of "Centrality dependence of identified particles in relativistic heavy ion collisions at sqrt(s)= 7.7-62.4 GeV"

BNL-RHIC. Elliptic flow ($v_{2}$) values for identified particles at midrapidity in Au + Au collisions measured by the STAR experiment in the Beam Energy Scan at the Relativistic Heavy Ion Collider at $\sqrt{s_{NN}}$ = 7.7-62.4 GeV are presented for three centrality classes. The centrality dependence and the data at $\sqrt{s_{NN}}$ = 14.5 GeV are new. Except at the lowest beam energies we observe a similar relative $v_{2}$ baryon-meson splitting for all centrality classes which is in agreement within 15% with the number-of-constituent quark scaling. The larger $v_{2}$ for most particles relative to antiparticles, already observed for minimum bias collisions, shows a clear centrality dependence, with the largest difference for the most central collisions. Also, the results are compared with A Multiphase Transport Model and fit with a Blast Wave model.

BNL-RHIC（布鲁克海文国家实验室-相对论重离子对撞机，Brookhaven National Laboratory-Relativistic Heavy Ion Collider）。本数据集呈现了相对论重离子对撞机束流能量扫描项目中，STAR实验在质心系碰撞能量$sqrt{s_{NN}}$ = 7.7~62.4 GeV能区下，金-金（Au+Au）碰撞中间快度区已鉴别粒子的椭圆流（Elliptic flow，$v_2$）数值，共涵盖三种中心度类别。其中不同中心度的依赖关系以及$sqrt{s_{NN}}$=14.5 GeV能区的数据为全新发布的结果。除最低束流能量能区外，所有中心度类别均展现出相似的重子-介子相对$v_2$分裂行为，该结果与组分夸克数标度的偏差在15%以内。多数粒子的$v_2$值大于其反粒子的$v_2$值的现象——该现象此前已在最小偏置碰撞中被观测到——展现出显著的中心度依赖性，在最中心的碰撞事件中该差异达到最大。本研究还将实验结果与多相输运模型（Multiphase Transport Model）进行了对比，并利用爆轰波模型（Blast Wave model）完成了拟合。