Energy and centrality dependences of charged multiplicity density in relativistic nuclear collisions

Abstract

Using a hadron and string cascade model, JPCIAE, the energy and centrality dependences of charged particle pseudorapidity density in relativistic nuclear collisions were studied. Within the framework of this model, both the relativistic $p+\bar{p}$ experimental data and the PHOBOS and PHENIX $Au+Au$ data at ${\sqrt{s}}_{nn}$=130 GeV could be reproduced fairly well without retuning the model parameters. The predictions for full RHIC energy $Au+Au$ collisions and for $Pb+Pb$ collisions at the ALICE energy were given. Participant nucleon distributions were calculated based on different methods. It was found that the number of participant nucleons, $<N_{part}>$, is not a well defined variable both experimentally and theoretically. Therefore, it is inappropriate to use charged particle pseudorapidity density per participant pair as a function of $<N_{part}>$ for distinguishing various theoretical models.

10 pages, 4 figures, submitted to Phy. Lett. B

References in corpus (3)

• Hadron production in nuclear collisions at RHIC and high density QCD
• Centrality Dependence of Charged Particle Multiplicity in Au-Au Collisions at sqrt(s_NN)=130 GeV
• Centrality Dependence of Hadron Multiplicities in Nuclear Collisions in the Dual Parton Model

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• Higher moment singularities explored by the net proton non-statistical fluctuations
• Centrality and pseudorapidity dependence of charged hadron production at intermediate p_T in Au + Au collisions at sqrt(s_NN) = 130 GeV
• A Hydrodynamic and Transport Model for Ultrarelativistic Heavy Ion Collisions at RHIC and LHC Energies