Charge asymmetry dependence of the elliptic flow splitting in relativistic heavy-ion collisions

Abstract

The elliptic flow splitting $\Delta v_2$ between $\bar{u}$ and $u$ quarks as well as between ${\pi }^{-}$ and ${\pi }^{+}$ in midcentral Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV has been studied, based on the framework of an extended multiphase transport model with the partonic evolution described by the chiral kinetic equations of motion. Within the available statistics, the slope of $\Delta v_2$ between $\bar{u}$ and $u$ quarks with respect to the electric charge asymmetry $A_{ch}$ from the linear fit is found to be negative, due to the correlation between the velocity and the coordinate in the initial parton phase-space distribution. Simulations with the magnetic field in QGP overestimate the splitting of the spin polarization between $\Lambda$ and $\bar{\Lambda }$ observed experimentally, with the latter more consistent with results under the magnetic field in vacuum. Considering the uncertainties from the magnetic field, the quark-antiquark vector interaction, and the hadronization, as well as the hadronic evolution, our study shows that the experimentally observed positive slope of $\Delta v_2$ with respect to $A_{ch}$ is not likely due to the chiral magnetic wave.

9 pages, 7 figures, a few typos corrected. arXiv admin note: text overlap with arXiv:1707.07262

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• Charge asymmetry dependence of flow and a novel correlator to detect the chiral magnetic wave in a multiphase transport model
• Search for the chiral magnetic wave using anisotropic flow of identified particles at RHIC
• Probing the Chiral Magnetic Wave with charge-dependent flow measurements in Pb-Pb collisions at the LHC
• Dynamical induced quark spin polarization by magnetic field at the early stage of heavy-ion collisions