"Table 171" 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相对论重离子对撞机（BNL-RHIC）STAR实验在束流能量扫描项目中获取的实验结果：在核子-核子质心系碰撞能量√s_NN = 7.7~62.4 GeV的金-金（Au+Au）对撞中心快度区，针对三类碰撞中心度区间，给出了已鉴别粒子的椭圆流（elliptic flow，$v_2$）数值。其中碰撞中心度依赖关系以及√s_NN=14.5 GeV下的实验数据为首次公开的新结果。除最低束流能量区间外，所有中心度区间均呈现出相似的重子-介子椭圆流相对分裂规律，该结果与组分夸克数标度的符合偏差在15%以内。此前在最小偏倚对撞中已观测到多数粒子的椭圆流数值大于对应反粒子的现象，该现象呈现出显著的中心度依赖特性，在最中心的碰撞事件中差异最为显著。本研究同时将实验结果与多相输运模型（Multiphase Transport Model）进行了对比，并采用爆炸波模型（Blast Wave model）完成了拟合。

搜集汇总

背景与挑战

背景概述

该数据集是STAR合作组在相对论重离子碰撞实验中测量的椭圆流（v2）数据，具体为'Table 171'，聚焦于Au+Au碰撞在能量39.0 GeV下，中心性10.0-40.0%范围内，XIBAR+粒子的v2随横向动量（PT）的变化。数据包括多个PT点的v2值，并提供了统计和系统误差，用于研究粒子产生机制和中心性依赖效应。数据集来自公开的HEPData存储库，采用CC0许可证，支持多种格式（如JSON、CSV），适用于高能物理分析。