Studying Effects of Evolution on Charge Separation in Small Collision System with A MultiPhase Transport model

TL;DR

This study investigates how the evolution of quark-gluon plasma droplets affects charge separation signals in small collision systems, suggesting they are promising for confirming the Chiral Magnetic Effect with minimal background interference.

Contribution

It demonstrates that charge separation signals can persist in small collision systems despite evolution effects, highlighting their potential for CME detection with low background influence.

Findings

Parton and hadron level evolution weaken charge separation signals.

Significant charge separation signals can still remain after evolution.

Background contributions to correlator $\Delta\gamma$ are negligible in small systems.

Abstract

In relativistic high energy heavy-ion collisions, Chiral Magnetic Effect (CME) could produce a charge separation in QGP. The charge separation could survive into final hadron system during evolution, observed as correlator $\Delta\gamma$. This physics procedure could also occurs in small collision system if CME emerge in the QGP droplet. In this paper, we study the effects of QGP droplet evolution on charge separation in small collision system, based on AMPT model. Our calculation indicates that, with given initial charge separation, the effects of parton level evolution and hadron level evolution weaken the charge separation indeed, but there is still enough signals could remained. Furthermore, we found that, the contribution of background to $\Delta\gamma$ is negligible in small collision system. So, we propose the small collision system being a good place to confirm contribution of CME.