Charge-dependent flow and the search for the chiral magnetic wave in Pb-Pb collisions at root S-NN=2.76 TeV
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M. B. and Zinovjev, G. and Zyzak, M. and ALICE Collaboration and ALICE
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Abstract
We report on measurements of a charge-dependent flow using a novel
three-particle correlator with ALICE in Pb-Pb collisions at the CERN
Large Hadron Collider (LHC), and discuss the implications for
observation of local parity violation and the chiral magnetic wave (CMW)
in heavy-ion collisions. Charge-dependent flow is reported for different
collision centralities as a function of the event charge asymmetry.
While our results are in qualitative agreement with expectations based
on the CMW, the nnonzero signal observed in higher harmonics correlations
indicates a possible significant background contribution. We also
present results on a differential correlator, where the flow of positive
and negative charges is reported as a function of the mean charge of the
particles and their pseudorapidity separation. We argue that this
differential correlator is better suited to distinguish the differences
in positive and negative charges expected due to the CMW and the
background effects, such as local charge conservation coupled with
strong radial and anisotropic flow.... Show more Show less