论文标题
恒星实验中Au+Au碰撞中保守电荷多数分布的累积物的测量
Measurement of cumulants of conserved charge multiplicity distributions in Au+Au collisions from the STAR experiment
论文作者
论文摘要
我们报告了Au+Au碰撞中的逐个事件Net-Proton，Net-Charge和Net-Kaon分布的累积依赖性，用于质量中心能量$ \ sqrt {s_ {nn}} $ = 54.4 GEV。对于净粒子分布的累积量（$ c_ {n}，n $ $ \ leq $ 4）观察到了强碰撞中心依赖性。累积比率$ c_ {3}/c_ {2} $，$ c_ {4}/c_ {2} $和$ c_ {6}/c_ {2} $表现出弱碰撞碰撞中心依赖性。 $ c_ {6}/c_ {2} $ net-proton和Net-Charge发行版，用于$ \ sqrt {s_ {nn}} $ = 54.4 GEV在同一碰撞系统的200 GEV时保持负面迹象，$ \ sqrt {s_ {nn}} $ = 54.4 GEV显示正符号。为了了解接受性和重子数量的效果，将测量值与在Star探测器接受度中计算出的URQMD和HIJING模型的期望进行了比较。
We report the collision-centrality dependence of cumulants of event-by-event net-proton, net-charge and net-kaon distributions in Au+Au collisions for center-of-mass energy $\sqrt{s_{NN}}$ = 54.4 GeV from the STAR experiment. Strong collision-centrality dependence is observed for cumulants ($C_{n}, n$ $\leq$ 4) of the net-particle distributions. The cumulant ratios $C_{3}/C_{2}$, $C_{4}/C_{2}$ and $C_{6}/C_{2}$ exhibit a weak collision-centrality dependence. The $C_{6}/C_{2}$ of net-proton and net-charge distributions for most central gold nuclei collisions at $\sqrt{s_{NN}}$ = 54.4 GeV show positive sign while they remain negative at 200 GeV for the same collision system. To understand effects of acceptance and baryon number conservation, the measurements are compared to expectations from the UrQMD and HIJING models calculated within the STAR detector acceptance.
