Pseudorapidity distributions of charged particles from Au+Au collisions at the maximum RHIC energy

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  • 7 December 2001
Abstract
We present charged particle densities as a function of pseudorapidity and collision centrality for the 197Au+197Au reaction at Sqrt{s_NN}=200 GeV, the maximum energy for RHIC. The charged particle multiplicity for the 5% most central events is 625 +/- 1 (stat) +/- 55 (syst), i.e. a 14% increase relative to Sqrt{s_NN}=130 GeV collisions. The total multiplicity of charged particles for -4.7<= eta <= 4.7 is 4630 +/- 370, an increase by 21% over the lower energy. The data show an increase from 2.9 to 3.7 in the production of charged particles per pair of participant nucleons from peripheral (40-50%) to central (0-5%) collisions around midrapidity. These results constrain current models based on high density QCD gluon saturation and on the superposition of particle production from soft hadronic and hard partonic collisions.

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