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arXiv 1708.03364nucl-exhep-ex
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RHIC射束能量扫描数据中的快度相关性

Rapidity correlations in the RHIC Beam Energy Scan Data

Sedigheh Jowzaee

发表信息：
Nuclear Physics A 967 (2017) 792-795
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摘要：

对归一化的两粒子协方差与两个粒子的快度，称为R $_2$，最初是在20世纪70年代的ISR和FNAL数据中研究的。这个变量最近在纵向重离子碰撞动力学研究中重新引起了人们的兴趣。这些快度相关可以被分解成具有前因子$\langle a_{mn}\rangle$的勒让德多项式的基组，其可以被认为是将方位各向异性分解成具有前因子v $_{\rm n}$的余弦函数的快度模拟。$\langle a_{mn}\rangle$值被认为是敏感的粒子发射源的数量，重子停止，粘度和临界行为。快度关联已被测量的STAR合作作为一个功能的光束能量为0-5%的中心金$+$金碰撞的光束能量范围从7.7到200 $\mathrm{GeV}$。的UrQMD模型的实验结果和比较。

英文摘要：

A pair-normalized two-particle covariance versus the rapidity of the two particles, called R$_2$, was originally studied in ISR and FNAL data in the 1970's. This variable has recently seen renewed interest for the study of the dynamics of heavy-ion collisions in the longitudinal direction. These rapidity correlations can be decomposed into a basis set of Legendre polynomials with prefactors $\langle a_{mn}\rangle$, which can be considered the rapidity analog of the decomposition of azimuthal anisotropies into a set of cosine functions with prefactors v$_{\rm n}$. The $\langle a_{mn}\rangle$ values have been suggested to be sensitive to the number of particle emitting sources, baryon stopping, viscosities, and critical behavior. The rapidity correlations have been measured by the STAR collaboration as a function of the beam energy for 0-5% central Au$+$Au collisions with beam energies ranging from 7.7 to 200 $\mathrm{GeV}$. The experimental results and comparisons to the UrQMD model are presented.

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