Contributions to the event-by-event charge asymmetry dependence for the elliptic flow of π+ and π− in heavy-ion collisions

We discuss various contributions to the event-by-event charge asymmetry dependence of π+ and π− elliptic flow, recently measured by the STAR Collaboration at RHIC. It is shown that under general assumptions, the difference between v2+ and v2− at a given fluctuating value of an asymmetry parameter, A, is a linear function of A, as observed in the preliminary data. We discuss two mechanisms that are qualitatively consistent with the experimental data and result in a signal of the correct order of magnitude. Our subsequent hydrodynamic calculations, assuming local charge conservation at freeze-out, yield a qualitative and partial quantitative understanding of the observed signal, so offering a detailed test of the hydrodynamic model in heavy-ion collisions.