Hadron production in heavy ion collisions: Fragmentation and recombination from a dense parton phase

2003/06/12 by R. J. Fries, B. Muller, C. Nonaka +1 · 1 citation
Physics and Astronomy · #nucl-th #hep-ph #nucl-ex

paper · pdf · doi:10.1103/physrevc.68.044902

published as Phys.Rev.C68:044902,2003 · 25 pages LaTeX, 18 figures; v2: some references updated; v3: some typos fixed

arxiv created 2003/06/12 · arxiv updated 2009/11/30

Abstract

We discuss hadron production in heavy ion collisions at RHIC. We argue that hadrons at transverse momenta P_T < 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 P_T > 2 GeV. Below P_T = 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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