Elliptic Flow Splitting between Particles and their Antiparticles in Au+Au Collisions from a Multiphase Transport Model

【摘要】 The elliptic flow v₂, for π^±, K^±, p and  in Au+Au collisions at center-of-mass energies (S_NN)^1/2= 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  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 △v₂ between p and  has been discussed. The simulation of Au+Au collisions at 14.5 GeV shows that the effect of hadron cascade to △v₂ is not obvious, and a larger parton-scattering cross section can lead to a larger △v₂.更多还原

【Abstract】 The elliptic flow v₂, for π^±, K^±, p and  in Au+Au collisions at center-of-mass energies (S_NN)^1/2= 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  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 △v₂ between p and  has been discussed. The simulation of Au+Au collisions at 14.5 GeV shows that the effect of hadron cascade to △v₂ is not obvious, and a larger parton-scattering cross section can lead to a larger △v₂.更多还原