Exploring the chiral magnetic effect in isobar collisions through Chiral Anomaly Transport

TL;DR

This study uses a new chiral anomaly transport model based on AMPT to simulate and analyze the chiral magnetic effect in isobar collisions, aligning well with experimental data and revealing a larger CME signal in Ru+Ru collisions.

Contribution

The paper introduces a novel chiral anomaly transport module integrated with AMPT to simulate CME signals in isobar collisions, providing insights consistent with recent experimental observations.

Findings

CME signal is larger in Ru+Ru than Zr+Zr collisions.

Simulation results match recent experimental charge correlation data.

Upper limit of CME signal is estimated at 15% in isobar collisions.

Abstract

We investigate the signal of the chiral magnetic effect (CME) in Au+Au collisions and isobar collisions of $_{44}^{96}\text{Ru}+\rm{} _{44}^{96}Ru$ and $_{40}^{96}\text{Zr}+\rm{}_{40}^{96}Zr$ in the newly developed chiral anomaly transport (CAT) module based on the state-of-the-art model a multiphase transport (AMPT). Our numerical simulation results for the ratio charge correlation $\Delta\gamma$ in Ru+Ru and Zr+Zr collisions are close to the latest experimental data. The simulation shows that the CME signal is larger in Ru+Ru collisions than that in Zr+Zr collisions, while the background is smaller, and the upper limit of the CME signal is $15\%$ in the isobar collisions.