Effects of mean-field and softening of equation of state on elliptic flow in Au+Au collisions at (~SNN)^(1/2)=5 GeV from the JAM model  

作　　者：陈佳敏 罗晓峰 刘峰 奈良寧 

机构地区：[1]Institute of Particle Physics and Key Laboratory of Quark&Lepton Physics (MOE), Central China Normal University, Wuhan 430079, China [2]Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA [3]Akita International University, Yuwa, Akita-city 010-1292, Japan [4]Frankfurt Institute for Advanced Studies, D-60438 Frankfurt am Main, Germany

出　　处：《Chinese Physics C》2018年第2期112-118,共7页中国物理C（英文版）

基　　金：Supported by the MoST of China 973-Project(2015CB856901);NSFC(11575069,11221504);supported by the Grants-in-Aid for Scientific Research from JSPS(15K05079,15K05098)

摘　　要：We perform a systematic study of elliptic flow（v2） in Au＋Au collisions at √^SNN = 5 GeV by using a microscopic transport model, JAM. The centrality, pseudorapidity, transverse momentum and beam energy dependence of v2 for charged as well as identified hadrons are studied. We investigate the effects of both the hadronic mean-field and the softening of equation of state（EoS） on elliptic flow. The softening of the EoS is realized by imposing attractive orbits in two body scattering, which can reduce the pressure of the system. We found that the softening of the EoS leads to the enhancement of v2, while the hadronic mean-field suppresses v2 relative to the cascade mode. It indicates that elliptic flow at high baryon density regions is highly sensitive to the EoS and the enhancement of v2 may probe the signature of a first-order phase transition in heavy-ion collisions at beam energies of a strong baryon stopping region.We perform a systematic study of elliptic flow（v2） in Au＋Au collisions at √^SNN = 5 GeV by using a microscopic transport model, JAM. The centrality, pseudorapidity, transverse momentum and beam energy dependence of v2 for charged as well as identified hadrons are studied. We investigate the effects of both the hadronic mean-field and the softening of equation of state（EoS） on elliptic flow. The softening of the EoS is realized by imposing attractive orbits in two body scattering, which can reduce the pressure of the system. We found that the softening of the EoS leads to the enhancement of v2, while the hadronic mean-field suppresses v2 relative to the cascade mode. It indicates that elliptic flow at high baryon density regions is highly sensitive to the EoS and the enhancement of v2 may probe the signature of a first-order phase transition in heavy-ion collisions at beam energies of a strong baryon stopping region.

关 键 词：heavy-ion collisions elliptic flow equation of state QCD phase transition 

分 类 号：O571[理学—粒子物理与原子核物理]