Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2003-06-05
Phys.Rev.C68:044902,2003
Physics
Nuclear Physics
Nuclear Theory
25 pages LaTeX, 18 figures; v2: some references updated; v3: some typos fixed
Scientific paper
10.1103/PhysRevC.68.044902
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 v_2 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.
Bass Steffen A.
Fries Rainer J.
Müller Berndt
Nonaka Chiho
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