Measurements of the chiral magnetic effect in Pb--Pb collisions with ALICE

TL;DR

This paper reports measurements of charge-dependent azimuthal correlations in Pb--Pb collisions at two energies, finding no significant energy dependence and comparing results with theoretical models to explore the chiral magnetic effect.

Contribution

First measurement of charge-dependent 3-particle azimuthal correlations at 5.02 TeV and comparison with 2.76 TeV data in Pb--Pb collisions.

Findings

No significant difference in charge-sensitive correlator between energies

Charge-dependent correlator results are consistent with blast-wave model predictions

Provides insights into the presence of the chiral magnetic effect in heavy-ion collisions.

Abstract

We present the measurement of the charge-dependent 3-particle azimuthal correlation for unidentified charged particles in Pb--Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV in ALICE. The results are compared with corresponding results from Pb--Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV. We observe no significant difference in the charge-sensitive 3-particle correlator ($\gamma_{112}$) between the two collision energies. Charged-dependent mixed-harmonic correlator ($\gamma_{132}$) is also presented and compared with the predictions from a blast-wave model incorporating local charge conservation.