Collective flow effects on charge balance correlations and local parity-violation observables in $\sqrt{s_{NN}}=2.76$ TeV Pb+Pb collisions at the LHC

TL;DR

This paper investigates how collective flow influences charge correlations in high-energy Pb+Pb collisions at the LHC, proposing new correlation measures and offering an alternative explanation for observed signals related to local charge conservation.

Contribution

It introduces a series of correlation measures to distinguish effects of collective flow and charge conservation, and provides an alternative interpretation of charge-dependent signals in heavy-ion collisions.

Findings

Charge dependent azimuthal correlations are consistent with local charge conservation.

The proposed correlations can help disentangle collective flow effects from other phenomena.

Current measurements do not necessarily indicate chiral-magnetic effects.

Abstract

We study the effects of collective flow on charge dependent azimuthal correlations at LHC energies. We propose a series of correlations as a signature of the combined effects of azimuthal collective flow and local charge conservation and perform an analysis within a statistical freeze-out model. We find that present LHC measurements of charge dependent azimuthal correlations are consistent with local charge conservation on the kinetic freeze-out surface. In view of experimental searches for signatures of the chiral-magnetic effect, we provide an alternative explanation of the charge dependence of the observed signal and propose additional measurements to disentangle the effects.