重离子碰撞中临界线和假想临界点附近的重子成团
Baryon clustering at the critical line and near the hypothetical critical point in heavy-ion collisions
摘要：
本文研究了相对论性重离子碰撞中冻结点处的重子成团现象。使用Walecka-Serot模型的核子-核子（NN）的相互作用，我们分析了如何修改/临界$σ$模式-负责NN吸引-当系统接近一个可能的临界点QCD允许的核子集群。我们研究了几个核子组成的团簇，以及长寿命时团簇的内部结构。对于现实的重离子碰撞，我们研究了如何在有限时间内形成这样的集群，并进行了统计分析的累积量和高阶矩（偏度和峰度）的碰撞在RHIC的束能量扫描。
英文摘要：
We study clustering of baryons at the freeze-out point of relativistic heavy-ion collisions. Using a Walecka-Serot model for the nucleon-nucleon (NN) interaction we analyze how the modified/critical $σ$ mode---responsible for the NN attraction---allows for clustering of nucleons when the system is close to a possible critical point of QCD. We investigate clusters of few nucleons, and also the internal cluster configuration when the system is long lived. For realistic heavy-ion collisions we study to how extend such clusters can be formed in a finite time, and perform the statistical analysis of cumulants and higher-order moments (skewness and kurtosis) for collisions at the Beam Energy Scan of RHIC.
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