Directed Flow of Identified Particles in Au+Au Collisions at √SNN=200  GeV at RHIC

Adamczyk, L. and Planinić, Mirko and Poljak, Nikola and Zoulkarneeva, Y. (STAR Collaboration) (2012) Directed Flow of Identified Particles in Au+Au Collisions at √SNN=200  GeV at RHIC. Physical Review Letters, 108 (20). pp. 202301-6. ISSN 0031-9007

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STAR’s measurements of directed flow (v1) around midrapidity for π±, K±, K0S, p, and p¯ in Au+Au collisions at √sNN=200  GeV are presented. A negative v1(y) slope is observed for most of produced particles (π±, K±, K0S, and p¯). In 5%–30% central collisions, a sizable difference is present between the v1(y) slope of protons and antiprotons, with the former being consistent with zero within errors. The v1 excitation function is presented. Comparisons to model calculations (RQMD, UrQMD, AMPT, QGSM with parton recombination, and a hydrodynamics model with a tilted source) are made. For those models which have calculations of v1 for both pions and protons, none of them can describe v1(y) for pions and protons simultaneously. The hydrodynamics model with a tilted source as currently implemented cannot explain the centrality dependence of the difference between the v1(y) slopes of protons and antiprotons.

Item Type: Article
Date: May 2012
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2012) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119-0982887-1006
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 05 Jun 2014 11:12
Last Modified: 23 Feb 2016 16:06

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