Hadron production in heavy ion collisions: Fragmentation and recombination from a dense parton phase
R. J. Fries, B. Muller, C. Nonaka, S. A. Bass
Abstract
We discuss hadron production in heavy ion collisions at RHIC. We argue that hadrons at transverse momenta PT < 5 GeV are formed by recombination of partons from the dense parton phase created in central collisions at RHIC. We provide a theoretical description of the recombination process for PT > 2 GeV. Below PT = 2 GeV our results smoothly match a purely statistical description. At high transverse momentum hadron production is well described in the language of perturbative QCD by the fragmentation of partons. We give numerical results for a variety of hadron spectra, ratios and nuclear suppression factors. We also discuss the anisotropic flow v2 and give results based on a flow in the parton phase. Our results are consistent with the existence of a parton phase at RHIC hadronizing at a temperature of 175 MeV and a radial flow velocity of 0.55c.
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