Effects of mean-field and softening of equation of state on elliptic flow in Au plus Au collisions at √sNN=5 GeV from the JAM model

We perform a systematic study of elliptic flow (v(2)) in Au+Au collisions at root(NN)-N-s = 5 GeV by using a microscopic transport model, JAM. The centrality, pseudorapidity, transverse momentum and beam energy dependence of v(2) 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 v(2), while the hadronic mean-field suppresses v(2) 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 v(2) may probe the signature of a first-order phase transition in heavy-ion collisions at beam energies of a strong baryon stopping region.