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

By B.I. Abelev, Y. Bai, F. Benedosso, M.A.J. Botje, E Braidot, O. Grebenyuk, A. Mischke, T. Peitzmann, M.J. Russcher, R.J.M. Snellings, N. van der Kolk and M. van Leeuwen


The event azimuthal anisotropy with respect to the reaction plane has been widely studied in order to evaluate the collective behavior of the matter produced in high-energy nuclear collisions [1, 2, 3]. The initial configuration space anisotropy is expected to be self-quenched by expansion and reduced by frequent re-scatterings in the hot and dense medium created in such collisions. The final observed momentum space anisotropies, therefore, carry information about the early stage collision dynamics [4, 5, 6]. The experimental results of the second harmonic azimuthal anisotropy, elliptic flow, v2, from Au + Au collisions have demonstrated the development of partonic collectivity [7, 8, 9, 10]. Further detailed analyses of the hadron mass dependence of v2 suggest that the system has been in the deconfined state with constituent quark degrees of freedom prior to hadronization [11, 12, 13]. Furthermore, results of multi-strange hadron transverse momentum distributions and v2 indicate that the system reached thermalization at the partonic stage [14, 15, 16, 17]

Year: 2008
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