标题： 离子-离子碰撞中多重性涨落的中心性依赖性来自FAIR的束流能量扫描 显示英文标题

标题： Centrality Dependence of Multiplicity Fluctuations in Ion-Ion Collisions from the Beam Energy Scan at FAIR

摘要： 多重分布和在未来的重离子实验中金金碰撞事件的逐事件多重性涨落，在反质子和离子研究设施（FAIR）的能区被研究。对应于FAIR能区的事件在极端相对论量子分子动力学（URQMD）模型框架内进行模拟。观察到多重分布的均值和宽度随着束流能量单调增加。对于5%中心度区间宽度，分散度与参与核子数平均值的变化趋势符合中心极限定理。在各种中心度区间以及完整事件样本中的多重分布被观察到遵循Koba、Nielsen和Olesen（KNO）标度。随着束流能量变化的标度方差的变化趋势也支持更大碰撞中心度的KNO标度预测。研究结果还表明，5%中心度区间宽度的统计涨落在控制之中。 显示英文摘要

摘要： Multiplicity distributions and event-by-event multiplicity fluctuations in AuAu collisions at energies in future heavy-ion experiment at the Facility for Anti-proton and Ion Research (FAIR) are investigated. Events corresponding to FAIR energies are simulated in the frame work of Ultra Relativistic Quantum Molecular Dynamics (URQMD) model. It is observed that the mean and the width of multiplicity distributions monotonically increase with beam energy. The trend of variations of dispersion with mean number of participating nucleons for the centrality-bin width of 5\% are in accord with the Central Limit Theorem. The multiplicity distributions in various centrality bins as well as for full event samples are observed to obey Koba, Nielsen and Olesen (KNO) scaling. The trends of variations of scaled variance with beam energy are also found to support the KNO scaling predictions for larger collision centrality. The findings also reveal that the statistical fluctuations in 5\% centrality-bin width appear to be under control.