Centrality dependence of the charged particle multiplicity near mid-rapidity in Au + Au collisions at s\sqrt{s} (NN) = 130-GeV and 200-GeV

Collaboration
Jan, 2002
5 pages
Published in:
  • Phys.Rev.C 65 (2002) 061901
e-Print:
Experiments:

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Abstract: (arXiv)
The PHOBOS experiment has measured the charged particle multiplicity at mid-rapidity in Au+Au collisions at sqrt(s_NN) = 200 GeV as a function of the collision centrality. Results on dN/deta(eta<1) divided by the number of participating nucleon pairs, , are presented as a function of . As was found from similar data at sqrt(s_NN) = 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 R(200/130) of the charged particle multiplicity for the two different energies as a function of . For events with >100$, we find that this ratio is consistent with a constant value of 1.14+-0.01(stat.)+-0.05(syst.).
Note:
  • 5 pages, 2 figures, submitted to Phys. Rev. C - Rapid Communications
  • 25.75.Dw
  • nucleus nucleus: colliding beams
  • scattering: heavy ion
  • gold
  • hadron: multiple production
  • charged particle: multiplicity
  • energy dependence
  • rapidity: central region
  • rapidity: density
  • impact parameter: dependence