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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 Δ v 2 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 Δ v 2 is not obvious, and a larger parton-scattering cross section can lead to a larger Δ v 2 .