Hadron Production and Radial Flow in AU+AU Collisions at Rhic-Phenix

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The centrality dependence of transverse momentum distributions and yields for π±, K±, p and /line{p} in Au+Au collisions at √ {s{ NN}}= 200 GeV are measured by the PHENIX experiment at RHIC. The single particle spectra are well fitted with a hydrodynamic-inspired parameterization, termed the "blast-wave" model, to extract freeze-out temperature and radial flow velocity of the particle source. Another motivation is that the suppression of high-pT hadron as a probe of QGP formation. In central collisions at intermediate transverse momenta 1.5 - 4.5 GeV/c, proton and anti-proton yields constitute a significant fraction of the charged hadron production and show a scaling behavior different from that of pions.

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