Charge-dependent flow and the search for the Chiral Magnetic Wave in Pb-Pb collisions at √sNN = 2.76 TeV

Adam, J. and Antičić, Tome and Erhardt, Filip and Gotovac, Sven and Mudnić, Eugen and Planinić, Mirko and Poljak, Nikola and Simatović, Goran and Utrobičić, Antonija and Vicković, Linda and Zyzak, M. (ALICE Collaboration) (2016) Charge-dependent flow and the search for the Chiral Magnetic Wave in Pb-Pb collisions at √sNN = 2.76 TeV. Physical Review C, 93 (4). pp. 44903-14. ISSN 2469-9985

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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 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.

Item Type: Article
Keywords: charge-dependent flow ; chiral magnetic Wave ; lead-lead
Date: 8 April 2016
Subjects: NATURAL SCIENCES > Physics
Additional Information: © 2016 CERN, for the ALICE Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Received 18 December 2015. Published 8 April 2016.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 16 Sep 2017 17:55
Last Modified: 16 Sep 2017 17:55
URI: http://digre.pmf.unizg.hr/id/eprint/5562

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