Evolution of topological charge through chiral anomaly transport

TL;DR

This paper introduces a new chiral anomaly transport module integrated into a multiphase transport model to simulate the evolution of topological charge and predict experimental signals of the chiral magnetic effect in heavy ion collisions.

Contribution

The paper develops a novel chiral anomaly transport module within the AMPT model to trace topological charge evolution and predict CME signals quantitatively.

Findings

CME signals are consistent with experimental measurements.

Charge separation evolution is explicitly modeled.

CME fraction depends on fireball temperature.

Abstract

Built upon the state-of-the-art model a multiphase transport (AMPT), we develop a new module of chiral anomaly transport (CAT), which can trace the evolution of the initial topological charge of gauge field created through sphaleron transition at finite temperature and external magnetic field in heavy ion collisions. The eventual experimental signals of chiral magnetic effect(CME) can be measured. The CAT explicitly shows the generation and evolution of the charge separation, and the signals of CME through the CAT are quantitatively in agreement with the experimental measurements in Au+Au collision at $\sqrt{s}=200 {\rm GeV}$, and the centrality dependence of the CME fraction follows that of the fireball temperature.