Abstract：The elliptic flow $v_2$, for $\pi^\pm$, $K^\pm$, $p$ and $\bar {p}$ in Au+Au collisions at center-of-mass energies $\sqrt {s_{_{\rm NN}}}=7.7$, 11.5, 14.5 and 19.6 GeV, is analyzed using a multiphase transport model. A significant difference in the $v_2$ values for $p$ and $\bar {p}$ is observed, and the values of $v_2$ splitting are larger compared with $\pi^+$ and $\pi^-$, $K^+$ 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 $\Delta v_2$ between $p$ and $\bar {p}$ has been discussed. The simulation of Au+Au collisions at 14.5 GeV shows that the effect of hadron cascade to $\Delta v_2$ is not obvious, and a larger parton-scattering cross section can lead to a larger $\Delta v_2$.
(Relativistic heavy-ion collisions (collisions induced by light ions studied to calibrate relativistic heavy-ion collisions should be classified under both 25.75.-q and sections 13 or 25 appropriate to the light ions))
(Quark deconfinement, quark-gluon plasma production, and phase transitions)
引用本文:
. [J]. 中国物理快报, 2017, 34(6): 62501-.
Zhen-Yu Xu, Jian-Li Liu, Pan-Pan Zhang, Jing-Bo Zhang, Lei Huo. Elliptic Flow Splitting between Particles and their Antiparticles in Au+Au Collisions from a Multiphase Transport Model. Chin. Phys. Lett., 2017, 34(6): 62501-.
2017, Vol. 34 
