Signature of QCD critical point: Anomalous transverse velocity dependence of antiproton–proton ratio
Signature of QCD critical point: Anomalous transverse velocity dependence of antiproton–proton ratio
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DOI：
10.1016/j.physletb.2009.02.044
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发表时间：
2009-02
影响因子：
4.4
通讯作者：
Xiaofeng Luo;M. Shao;Cheng Li;Hong-fang Chen
中科院分区：
文献类型：
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作者：
Xiaofeng Luo;M. Shao;Cheng Li;Hong-fang Chen
本文提出了由Asakawa等人最近提出的QCD临界点聚焦效应对反质子/质子比（p <$/p）的横向速度（βt）的依赖关系，作为高能重离子碰撞（HIC）中QCD临界点的实验特征.在定量分析方面，利用超相对论量子分子动力学（UrQMD）输运模型和THERMal重离子发生器（THERMINATOR）计算了QCD相图上三种不同聚焦程度的Gedanken聚焦等熵轨线对应的p ′/p比值β t依赖关系.最后，我们得到了p ′/p比值与β t相关的一个可观测异常，它可以作为QCD临界点的一个特征.
We formulate the QCD critical point focusing effect on transverse velocity (βt) dependence of antiproton to proton (p¯/p) ratio, which was recently proposed by Asakawa et al. as an experimental signature of QCD critical point in high energy heavy ion collisions (HICs). For quantitative analysis, Ultra-relativistic Quantum Molecular Dynamics (UrQMD) transport model and THERMal heavy-IoN generATOR (THERMINATOR) are applied to calculate the corresponding βtdependence of p¯/p ratio for three gedanken focused isentropic trajectories with different focusing degree on QCD phase diagram. Finally, we obtained an observable anomaly in βtdependence of p¯/p ratio, which can be employed as a signature of QCD critical point.