Phys. Rev. C 65, 061901(R) (2002) [4 pages]Centrality dependence of the charged particle multiplicity near midrapidity in Au+Au collisions at √sNN=130 and 200 GeV
The PHOBOS experiment has measured the charged particle multiplicity at midrapidity in Au+Au collisions at √sNN=200 GeV as a function of the collision centrality. Results on dNch/dη||η|<1 divided by the number of participating nucleon pairs 〈Npart〉/2 are presented as a function of 〈Npart〉. As was found from similar data at √sNN=130 GeV, the data can be equally well described by parton saturation models and two-component fits, which include contributions that scale as Npart and the number of binary collisions Ncoll. We compare the data at the two energies by means of the ratio R200/130 of the charged particle multiplicity for the two different energies as a function of 〈Npart〉. For events with 〈Npart〉>100, we find that this ratio is consistent with a constant value of 1.14±0.01(stat)±0.05(syst). © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevC.65.061901
DOI:
10.1103/PhysRevC.65.061901
PACS:
25.75.Dw
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