Azimuthal Anisotropy in U+U and Au+Au Collisions at RHIC

Adamczyk, L. and Planinić, Mirko and Poljak, Nikola and Zyzak, M. (STAR Collaboration) (2015) Azimuthal Anisotropy in U+U and Au+Au Collisions at RHIC. Physical Review Letters, 115 (22). pp. 222301-7. ISSN 0031-9007

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Collisions between prolate uranium nuclei are used to study how particle production and azimuthal anisotropies depend on initial geometry in heavy-ion collisions. We report the two- and four-particle cumulants, v2{2} and v2{4}, for charged hadrons from U+U collisions at √sNN=193  GeV and Au+Au collisions at √sNN√=200  GeV. Nearly fully overlapping collisions are selected based on the energy deposited by spectators in zero degree calorimeters (ZDCs). Within this sample, the observed dependence of v2{2} on multiplicity demonstrates that ZDC information combined with multiplicity can preferentially select different overlap configurations in U+U collisions. We also show that v2 vs multiplicity can be better described by models, such as gluon saturation or quark participant models, that eliminate the dependence of the multiplicity on the number of binary nucleon-nucleon collisions.

Item Type: Article
Keywords: STAR, anisotropy
Date: 15 November 2015
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2015) by the American Physical Society. Received 28 May 2015; revised manuscript received 14 October 2015; published 24 November 2015.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 31 Mar 2016 06:56
Last Modified: 02 Dec 2017 17:34

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