Contributions to the event-by-event charge asymmetry dependence for the elliptic flow of pi^{+} and pi^{-} in heavy-ion collisions

Adam Bzdak; Piotr Bozek

doi:10.1016/j.physletb.2013.08.003

paper

Contributions to the event-by-event charge asymmetry dependence for the elliptic flow of pi^{+} and pi^{-} in heavy-ion collisions

arXiv:1303.1138 · doi:10.1016/j.physletb.2013.08.003

Abstract

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 $v_{2}^{+}$ and $v_{2}^{-}$ 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.

10 pages, 4 figures; added discussion in section 5, updated plot in section 4, added references

Contributions to the event-by-event charge asymmetry dependence for the elliptic flow of pi^{+} and pi^{-} in heavy-ion collisions

Abstract

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