System-Size Independence of Directed Flow Measured at the BNL Relativistic Heavy-Ion Collider

Abelev, B. I. and Planinić, Mirko and Poljak, Nikola and Zuo, J. X. (STAR Collaboration) (2008) System-Size Independence of Directed Flow Measured at the BNL Relativistic Heavy-Ion Collider. Physical Review Letters, 101 (25). pp. 252301-6. ISSN 0031-9007

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Abstract

We measure directed flow (v1) for charged particles in Au+Au and Cu+Cu collisions at √sNN=200 and 62.4 GeV, as a function of pseudorapidity (η), transverse momentum (pt), and collision centrality, based on data from the STAR experiment. We find that the directed flow depends on the incident energy but, contrary to all available model implementations, not on the size of the colliding system at a given centrality. We extend the validity of the limiting fragmentation concept to v1 in different collision systems, and investigate possible explanations for the observed sign change in v1(pt).

Item Type: Article
Keywords: Au+Au and Cu+Cu collisions
Date: December 2008
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2008) 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: 10 Jun 2014 12:38
Last Modified: 10 Jun 2014 12:38
URI: http://digre.pmf.unizg.hr/id/eprint/2338

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