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In a multiphase transport model with the initial electric quadrupole moment,we studied and discussed the charge asymmetry ($A_{\rm ch}$) dependence of flowat varied kinematic windows in semi-central Au+Au collisions at $\sqrt{s_{\rmNN}}$ = 200 GeV. We then proposed a novel correlator $W$ which speciallyfocuses on the difference of elliptic flow between positively and negativelycharged hadrons induced by the chiral magnetic wave and, more importantly, isirrelevant to the ambiguous $A_{\rm ch}$. We found that the distribution of thesecond order correlator $W_2$ displays a convex structure in the absence of thequadrupole and a concave shape in the presence of the quadrupole. We alsostudied the response of $W_n$ for both signal and resonance background in a toymodel and in analytical calculation. Such a method provides a new way to detectthe chiral magnetic wave.

Charge asymmetry dependence of flow and a novel correlator to detect the chiral magnetic wave in a multiphase transport model