Elliptic Flow Difference Between Particles and Antiparticles and the EOS of Baryon-rich Matter
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We review our recent studies of mean-field effects on the elliptic flows of particles and antiparticles in heavy ion collisions at energies carried out in the Beam Energy Scan (BES) program at the Relativistic Heavy Ion Collider (RHIC). Including mean-field potentials in the hadronic phase of a multiphase transport (AMPT) model, we have found that the elliptic flows are larger for p, K+, and - than for p, K-, and +, respectively, as observed by the STAR Collaboration. Using a partonic transport model based on the Nambu-Jona-Lasinio (NJL) model, we have also found that the vector mean-field potentials in the baryon-rich quark matter lead to a larger quark than antiquark elliptic flows in these collisions. Using the quark coalescence model to convert quarks and antiquarks to hadrons, we have further found a splitting of the p and p, and , and K+ and K- elliptic flows with their differences depending on the strength of the quark vector coupling. Our studies have thus demonstrated the possibility of extracting information on the properties of baryon-rich quark-gluon plasma from the BES program at RHIC.
