Elliptic flow splitting between particles and their antiparticles in Au+Au collisions from a multiphase transport model

The elliptic flow v₂, for π^±, K^±, p and P in Au+Au collisions at center-of-mass energies S_NN = 7.7, 11.5, 14.5 and 19.6 GeV, is analyzed using a multiphase transport model. A significant difference in the v2 values for p and P is observed, and the values of v₂ splitting are larger compared with π⁺ and π^-, K⁺ and K^- The difference increases with decreasing the center-of-mass energy. The effect of the quark coalescence mechanism in a multi-phase transport model to the value of elliptic difference δv₂ between p and P has been discussed. The simulation of Au+Au collisions at 14.5 GeV shows that the effect of hadron cascade to δv₂ is not obvious, and a larger parton-scattering cross section can lead to a larger δv₂.