Elliptic Flow Differences between Baryons and Anti-Baryons in Heavy-Ion Collisions Using SMASH Model  

作　　者：Shuai Zhou Shusu Shi 

机构地区：[1]Key Laboratory of Quark and Lepton Physics(MOE)and Institute of Particle Physics,Central China Normal University,Wuhan 430079,China

出　　处：《Chinese Physics Letters》2025年第2期31-35,共5页中国物理快报(英文版)

基　　金：supported in part by the National Key Research and Development Program of China(Grant Nos.2022YFA1604900 and 2024YFA1610700);the National Natural Science Foundation of China(Grant No.12175084)。

摘　　要：Significant differences exist in the elliptic flowυ2 for particles and their corresponding anti-particles.These differences,which are more significant for baryons and anti-baryons,were observed from the solenoidal tracker(STAR)experiment during Beam Energy Scan I(BES-I)at relativistic heavy ion collider(RHIC).By employing the simulated many-accelerated strongly interacting hadrons(SMASH)model,we studied the ν_(2) differences between protons and anti-protons as well as between ∧ and ∧^(-)in Au+Au collisions at √S_(NN)=7.7 GeV as a function of the evolution time.It was found that as the evolution time increases,the𝑣2 differences between protons and anti-protons become more significant than those between ∧ and ∧^(-).This phenomenon can be explained by the different constituent quarks of protons and ∧.Given that some of the𝑢and𝑑quarks come from the colliding nuclei and are transported to midrapidity,they undergo more interactions than the produced quarks,resulting in protons Δν_(2) being larger than ∧Δν_(2).We compared the SMASH calculations with STAR BES-Ⅰ data and concluded that higher-precision data from BES-Ⅱ will set constraints on theoretical frameworks to interpret the ν_(2) differences between particles and anti-particles.

关 键 词：particles. QUARK constraints 

分 类 号：O57[理学—粒子物理与原子核物理]