Correlated Event-by-Event Fluctuations of Flow Harmonics in Pb-Pb Collisions at √sNN=2.76 TeV

Adam, J. and Antičić, Tome and Gotovac, Sven and Erhardt, Filip and Mudnić, Eugen and Planinić, Mirko and Poljak, Nikola and Simatović, Goran and Utrobičić, Antonija and Vicković, Linda and Zyzak, M. (2016) Correlated Event-by-Event Fluctuations of Flow Harmonics in Pb-Pb Collisions at √sNN=2.76 TeV. Physical Review Letters, 117 (18). pp. 182301-14. ISSN 0031-9007

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Abstract

We report the measurements of correlations between event-by-event fluctuations of amplitudes of anisotropic flow harmonics in nucleus-nucleus collisions, obtained for the first time using a new analysis method based on multiparticle cumulants in mixed harmonics. This novel method is robust against systematic biases originating from nonflow effects and by construction any dependence on symmetry planes is eliminated. We demonstrate that correlations of flow harmonics exhibit a better sensitivity to medium properties than the individual flow harmonics. The new measurements are performed in Pb-Pb collisions at the center-of-mass energy per nucleon pair of √sNN = 2.76 TeV by the ALICE experiment at the Large Hadron Collider. The centrality dependence of correlation between event-by-event fluctuations of the elliptic v2 and quadrangular v4 flow harmonics, as well as of anticorrelation between v2 and triangular v3 flow harmonics are presented. The results cover two different regimes of the initial state configurations: geometry dominated (in midcentral collisions) and fluctuation dominated (in the most central collisions). Comparisons are made to predictions from Monte Carlo Glauber, viscous hydrodynamics, AMPT, and HIJING models. Together with the existing measurements of the individual flow harmonics the presented results provide further constraints on the initial conditions and the transport properties of the system produced in heavy-ion collisions.

Item Type: Article
Date: 28 October 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. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Received 4 May 2016; published 28 October 2016.
Divisions: Faculty of Science > Department of Physics
Corporate Creators: ALICE Collaboration
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 01 Dec 2016 15:50
Last Modified: 01 Dec 2016 15:50
URI: http://digre.pmf.unizg.hr/id/eprint/5365

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