"Table 118" 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.

本数据集收录了美国布鲁克海文国家实验室（Brookhaven National Laboratory, BNL）相对论重离子对撞机（Relativistic Heavy Ion Collider, RHIC）束流能量扫描项目中，STAR实验在核子-核子质心系能量$sqrt{s_{NN}}$=7.7~62.4 GeV的金-金（Au+Au）碰撞快度中段处测得的已鉴别粒子椭圆流（elliptic flow, $v_2$）数值，涵盖三个中心度区间。其中，椭圆流的中心度依赖关系以及$sqrt{s_{NN}}$=14.5 GeV能区的实验数据为首次公开的新结果。除最低束流能量外，所有中心度区间均观测到相似的重子-介子弹子相对$v_2$分裂现象，该结果与组分夸克数标度（number-of-constituent quark scaling）的偏差在15%以内。此前在最小偏置碰撞中已观测到的多数粒子$v_2$大于其反粒子的现象，呈现出清晰的中心度依赖特征，在最中心的碰撞区间中差异最为显著。此外，本研究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。