Effects of nuclear potential on the cumulants of net-proton and net-baryon multiplicity distributions in Au plus Au collisions atv √SNN=5 GeV

被引：26
|
作者：
He, Shu [1 ,2 ]
Luo, Xiaofeng [1 ,2 ]
Nara, Yasushi [3 ]
Esumi, ShinIchi [4 ]
Xu, Nu [1 ,2 ,5 ]
机构：
[1] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China
[2] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China
[3] Akita Int Univ, Akita 0101292, Japan
[4] Univ Tsukuba, Ctr Integrated Res Fundamental Sci & Engn, Tsukuba, Ibaraki 305, Japan
[5] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA
来源：
PHYSICS LETTERS B | 2016年 / 762卷
关键词：
HEAVY-ION COLLISIONS; FREEZE-OUT CONDITIONS; QCD PHASE-TRANSITION; QUANTUM CHROMODYNAMICS; CHARGE FLUCTUATIONS; BASE-LINE; DIAGRAM; FRAMEWORK; MODEL;
D O I：
10.1016/j.physletb.2016.09.053
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We analyze the rapidity and transverse momentum dependence for the cumulants of the net-proton and net-baryon distributions in Au+Au collisions at root SNN = 5 GeV with a microscopic hadronic transport (JAM) model. To study the effects of mean field potential and softening of equation of state (EoS) on the fluctuations of net-proton (baryon) in heavy-ion collisions, the calculations are performed with two different modes. The softening of EoS is realized in the model by implementing the attractive orbit in the two-body scattering to introduce a reduction pressure of the system. By comparing the results from the two modes with the results from default cascade, we find the mean field potential and softening of EoS have strong impacts on the rapidity distributions (dN/dy) and the shape of the net-proton (baryon) multiplicity distributions. The net-proton (baryon) cumulants and their ratios calculated from all of the three modes are with similar trends and show significant suppression with respect to unity, which can be explained by the presence of baryon number conservations. It indicates that the effects of mean field potential and softening of EoS might be not the ingredients that are responsible to the observed strong enhancement in the most central Au+Au collisions at 7.7 GeV measured by the STAR experiment at RHIC. (C) 2016 The Authors. Published by Elsevier B.V.
引用
收藏
页码：296 / 300
页数：5
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