Observation of charge asymmetry dependence of pion elliptic flow and the possible chiral magnetic wave in heavy-ion collisions

STAR Collaboration, L. Adamczyk, J. K. Adkins +327

We present measurements of $\ddot{I}{€}^{-}$ and $\ddot{I}{€}^{+}$ elliptic flow, $v_2$, at midrapidity in Au+Au collisions at $\sqrt{s_{{}_{\mathrm{NN}}}}=$ 200, 62.4, 39, 27, 19.6, 11.5 and 7.7 GeV, as a fu…