Centrality dependence of charged hadron and strange hadron elliptic flow from √sNN=200 GeV Au+Au collisions

Abelev, B. I. and Planinić, Mirko and Poljak, Nikola and Zuo, J. X. (STAR Collaboration) (2008) Centrality dependence of charged hadron and strange hadron elliptic flow from √sNN=200 GeV Au+Au collisions. Physical Review C, 77 (5). pp. 54901-17. ISSN 0556-2813

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We present STAR results on the elliptic flow v_2 of charged hadrons, strange and multi-strange particles from √sNN=200 GeV Au+Au collisions at RHIC. The detailed study of the centrality dependence of v_2 over a broad transverse momentum range is presented. Comparison of different analysis methods are made in order to estimate systematic uncertainties. In order to discuss the non-flow effect, we have performed the first analysis of v_2 with the Lee-Yang Zero method for K_s^0 and Lambda. In the relatively low p_T region, p_T ≤ 2 GeV/c, a scaling with m_T - m is observed for identified hadrons in each centrality bin studied. However, we do not observe v_2(p_T) scaled by the participant eccentricity to be independent of centrality. At higher p_T, 2 GeV/c ≤ p_T ≤ 6 GeV/c, v_2 scales with quark number for all hadrons studied. For the multi-strange hadron Omega, which does not suffer appreciable hadronic interactions, the values of v_2 are consistent with both m_T -m scaling at low p_T and number-of-quark scaling at intermediate p_T. As a function of collision centrality, an increase of p_T-integrated v_2 scaled by the participant eccentricity has been observed, indicating a stronger collective flow in more central Au+Au collisions.

Item Type: Article
Keywords: transverse momentum range
Date: May 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 13:13
Last Modified: 10 Jun 2014 13:14
URI: http://digre.pmf.unizg.hr/id/eprint/2343

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