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 nonzero 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.

Charge-dependent flow and the search for the chiral magnetic wave in Pb-Pb collisions at √sN N = 2.76 TeV / Adam40, J., Adamová84, D., Aggarwal88, M.M., Aglieri Rinella36, G., Agnello110, M., Agrawal48, N., Ahammed132, Z., Ahn68, S.U., Aiola136, S., †, ., Akindinov58, A., Alam132, S.N., Aleksandrov80, D., Alessandro110, B., Alexandre101, D., Alfaro Molina64, R., Alici104, A., 12, ., Alkin3, A., Almaraz119, J.R.M., et al.. - In: PHYSICAL REVIEW C. - ISSN 2469-9985. - 93:4(2016). [10.1103/PhysRevC.93.044903]

Charge-dependent flow and the search for the chiral magnetic wave in Pb-Pb collisions at √sN N = 2.76 TeV

L. Cunqueiro
Membro del Collaboration Group
;
2016

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 nonzero 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.
2016
chiral-magnetic effect, heavy ion collisions, flow
01 Pubblicazione su rivista::01a Articolo in rivista
Charge-dependent flow and the search for the chiral magnetic wave in Pb-Pb collisions at √sN N = 2.76 TeV / Adam40, J., Adamová84, D., Aggarwal88, M.M., Aglieri Rinella36, G., Agnello110, M., Agrawal48, N., Ahammed132, Z., Ahn68, S.U., Aiola136, S., †, ., Akindinov58, A., Alam132, S.N., Aleksandrov80, D., Alessandro110, B., Alexandre101, D., Alfaro Molina64, R., Alici104, A., 12, ., Alkin3, A., Almaraz119, J.R.M., et al.. - In: PHYSICAL REVIEW C. - ISSN 2469-9985. - 93:4(2016). [10.1103/PhysRevC.93.044903]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1654530
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