Description of bulk properties of charged pions, kaons, and (anti)protons in Au plus Au collisions from the STAR experiment in the Beam Energy Scan program within the improved HIJING code: Role of initial-state interactions

摘要

We have investigated the production yields of charged pions, kaons, and (anti)protons (restricted to midrapidity of vertical bar y vertical bar < 0.1) in Au+Au collisions at root S-NN = 7.7, 11.5, 19.6, 27, and 39 GeV, from the STAR experiment in the Beam Energy Scan (BES) program at the Relativistic Heavy Ion Collider (RHIC), within an improved heavy-ion jet interaction generator (ImHIJING) code plus a relativistic transport (ART) model. Improvements of the dynamical content of ImHIJING code include (i) sampling of initial momenta of nuclear ground state, (ii) a Regge cascade for initial-state interaction effects, and (iii) an advanced popcorn mechanism for baryon production. It is found that the implementation of initial-state interactions in the ImHIJING-PART model is crucial for the description of collision centrality dependence of bulk hadron observables in peripheral and semicentral (approximate to 10%-70%) Au+Au collisions at root S-NN > 11.5 GeV.