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Systematic studies of charge-dependent two- and three-particle correlationsin Pb-Pb collisions at $\sqrt{\it{s}_\mathrm{{NN}}} = $ 2.76 and 5.02 TeV usedto probe the Chiral Magnetic Effect (CME) are presented. These measurements areperformed for charged particles in the pseudorapidity ($\eta$) and transversemomentum ($p_{\rm{T}}$) ranges $\left|\eta \right| < 0.8$ and $0.2 <p_{\mathrm{T}} < 5$ GeV/$c$. A significant charge-dependent signal that becomesmore pronounced for peripheral collisions is reported for the CME-sensitivecorrelators $\gamma_{1,1} = \langle \cos (\varphi_{\alpha} +\varphi_{\beta} -2\Psi_{2}) \rangle$ and $\gamma_{1,-3} = \langle \cos (\varphi_{\alpha}-3\varphi_{\beta} + 2\Psi_{2}) \rangle$. The results are used to estimate thecontribution of background effects, associated with local charge conservationcoupled to anisotropic flow modulations, to measurements of the CME. Ablast-wave parametrisation that incorporates local charge conservation tuned toreproduce the centrality dependent background effects is not able to fullydescribe the measured $\gamma_{1,1}$. Finally, the charge and centralitydependence of mixed-harmonics three-particle correlations, of the form$\gamma_{1,2} = \langle \cos (\varphi_{\alpha} +2\varphi_{\beta} - 3\Psi_{3})\rangle$, which are insensitive to the CME signal, verify again that backgroundcontributions dominate the measurement of $\gamma_{1,1}$.

the journal of high energy physics/the journal of high energy physics

Constraining the Chiral Magnetic Effect with charge-dependent azimuthal  correlations in Pb-Pb collisions at $\sqrt{\it{s}_{\mathrm{NN}}}$ = 2.76 and  5.02 TeV