Universal Behavior of Charged Particle Production in Heavy Ion Collisions

Details Universal Behavior of Charged Particle Production in Heavy Ion Collisions Universal Behavior of Charged Particle Production in Heavy Ion Collisions

2002-11-01

arxiv.org/abs/nucl-ex/0211002v1

Nucl.Phys.A715:490-493,2003

Physics

Nuclear Physics

Nuclear Experiment

4 Pages, 5 Figures, contributed to the Proceedings of Quark Matter 2002, Nantes, France, 18-24 July 2002

Scientific paper

10.1016/S0375-9474(02)01494-X

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.

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