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Universal Behavior of Charged Particle Production in Heavy Ion Collisions at RHIC Energies

By Peter Steinberg and PHOBOS Collaboration

Abstract

The PHOBOS experiment at RHIC has measured the multiplicity of primary charged particles as a function of centrality and pseudorapidity in Au+Au collisions at sqrt(s_NN) = 19.6, 130 and 200 GeV. Two kinds of universal behavior are observed in charged particle production in heavy ion collisions. The first is that forward particle production, over a range of energies, follows a universal limiting curve with a non-trivial centrality dependence. The second arises from comparisons with pp/pbar-p and e+e- data. N_tot/(N_part/2) in nuclear collisions at high energy scales with sqrt(s) in a similar way as N_tot in e+e- collisions and has a very weak centrality dependence. This feature may be related to a reduction in the leading particle effect due to the multiple collisions suffered per participant in heavy ion collisions.Comment: 3 Pages, 4 Figures, contributed to the Proceedings of the 31st International Conference on High Energy Physics, Amsterdam, Netherlands, 24-31 July, 200

Topics: Nuclear Experiment, High Energy Physics - Experiment
Publisher: 'Elsevier BV'
Year: 2002
DOI identifier: 10.1016/S0920-5632(03)90495-6
OAI identifier: oai:arXiv.org:nucl-ex/0210024

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