Suppression of elliptic-flow-induced correlations in an observable of possible local parity violation

TL;DR

This paper proposes a method to reduce background effects in measurements of local parity violation in heavy-ion collisions by using fluctuations in elliptic anisotropy, improving the detection of the chiral magnetic effect.

Contribution

It introduces a technique leveraging elliptic anisotropy fluctuations to suppress background contributions in observables related to local parity violation.

Findings

Fluctuations in elliptic anisotropy can significantly reduce background effects.

The magnetic field remains approximately independent of fireball shape fluctuations.

The method enhances the sensitivity to the chiral magnetic effect.

Abstract

We show that fluctuations in elliptic anisotropy in heavy-ion collisions can be used to significantly reduce the contribution of transverse-momentum conservation, and of all background effects independent on the orientation of the reaction plane, from an observable of the chiral magnetic effect. We argue that for a given impact parameter, the magnetic field is approximately independent of the fluctuating shape of the fireball.