Saturation of Azimuthal Anisotropy in Au+Au Collisions at sNN=62200GeV

S. S. Adler et al. (PHENIX Collaboration)
Phys. Rev. Lett. 94, 232302 – Published 17 June 2005

Abstract

New measurements are presented for charged hadron azimuthal correlations at midrapidity in Au+Au collisions at sNN=62.4 and 200 GeV. They are compared to earlier measurements obtained at sNN=130GeV and in Pb+Pb collisions at sNN=17.2GeV. Sizeable anisotropies are observed with centrality and transverse momentum (pT) dependence characteristic of elliptic flow (v2). For a broad range of centralities, the observed magnitudes and trends of the differential anisotropy, v2(pT), change very little over the collision energy range sNN=62200GeV, indicating saturation of the excitation function for v2 at these energies. Such a saturation may be indicative of the dominance of a very soft equation of state for sNN60200GeV.

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  • Received 19 November 2004

DOI:https://doi.org/10.1103/PhysRevLett.94.232302

©2005 American Physical Society

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Vol. 94, Iss. 23 — 17 June 2005

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