Ω and ? production in Au + Au collisions at (S_(NN))^(1/2)=11.5 and 7.7 GeV in a dynamical quark coalescence model  

作　　者：Xiao-Hai Jin Jin-Hui Chen Yu-Gang Ma Song Zhang Chun-Jian Zhang Chen Zhong 

机构地区：[1]Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China [2]University of Chinese Academy of Sciences, Beijing 100049,China [3]Shanghai Tech University, Shanghai 200031, China

出　　处：《Nuclear Science and Techniques》2018年第4期121-127,共7页核技术（英文）

基　　金：supported in part by the Major State Basic Research Development Program in China(Nos.2014CB845400 and2015CB856904);the National Natural Science Foundation of China(Nos.11775288,11421505,and 11520101004)

摘　　要：The Ω and ? production in relativistic heavy-ion collisions is studied in a dynamical quark coalescence model using the phase space information of strange quarks from a multiphase transport(AMPT) model. Enhanced local parton density fluctuation is implemented in the AMPT to simulate the QCD phase transition dynamics. By studying the transverse momentum pT spectra and the elliptic flow of the multi-strangeness particles, such as Ω and ? , and the Ω/? ratio as a function of pTin the AMPT,we find that the new development improves the description of experimental data. The study motivates further experimental investigations of Ω and ? production in phase Ⅱ of the Beam Energy Scan program at RHIC.The Ω and ? production in relativistic heavy-ion collisions is studied in a dynamical quark coalescence model using the phase space information of strange quarks from a multiphase transport(AMPT) model. Enhanced local parton density fluctuation is implemented in the AMPT to simulate the QCD phase transition dynamics. By studying the transverse momentum pT spectra and the elliptic flow of the multi-strangeness particles, such as Ω and ? , and the Ω/? ratio as a function of pTin the AMPT,we find that the new development improves the description of experimental data. The study motivates further experimental investigations of Ω and ? production in phase Ⅱ of the Beam Energy Scan program at RHIC.

关 键 词：QCD phase transition Multi-strangeness particles ELLIPTIC flow AMPT 

分 类 号：O572.33[理学—粒子物理与原子核物理]