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.
Categories: hep-ph nucl-th