Isolation of flow and nonflow correlations by two- and four-particle cumulant measurements of azimuthal harmonics in √sNN = 200 GeV Au+Au collisions

Abdelwahab, N. M. and Planinić, Mirko and Poljak, Nikola and Zyzak, M. (STAR Collaboration) (2015) Isolation of flow and nonflow correlations by two- and four-particle cumulant measurements of azimuthal harmonics in √sNN = 200 GeV Au+Au collisions. Physics Letters B, 745. pp. 40-47. ISSN 0370-2693

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Abstract

A data-driven method was applied to Au+Au collisions at √sNN = 200 GeV made with the STAR detector at RHIC to isolate pseudorapidity distance η-dependent and η-independent correlations by using two- and four-particle azimuthal cumulant measurements. We identified a η-independent component of the correlation, which is dominated by anisotropic flow and flow fluctuations. It was also found to be independent of η within the measured range of pseudorapidity |η| < 1. In 20–30% central Au+Au collisions, the relative flow fluctuation was found to be 34%±2%(stat.)±3%(sys.) for particles with transverse momentum pT less than 2 GeV/c. The η-dependent part, attributed to nonflow correlations, is found to be 5% ± 2%(sys.) relative to the flow of the measured second harmonic cumulant at |η| > 0.7.

Item Type: Article
Keywords: heavy-ion, flow, nonflow
Date: 2015
Subjects: NATURAL SCIENCES > Physics
Additional Information: © 2015 The Authors. Received 6 September 2014, Revised 24 February 2015, Accepted 19 April 2015, Available online 21 April 2015. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3.
Divisions: Faculty of Science > Department of Physics
Publisher: Elsevier
Depositing User: Nikola Poljak
Date Deposited: 07 May 2015 10:58
Last Modified: 07 May 2015 10:58
URI: http://digre.pmf.unizg.hr/id/eprint/3954

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