Gluon Shadowing and Hadron Production at RHIC

Abstract

Hadron multiplicity in the central rapidity region of high-energy heavy-ion collisions is investigated within a two-component mini-jet model which consists of soft and semi-hard particle production. The hard contribution from mini-jets is reevaluated using the latest parameterization of parton distributions and nuclear shadowing. The energy dependence of the experimental data from RHIC requires a strong nuclear shadowing of the gluon distribution in this model. The centrality dependence of the hadron multiplicity at $\sqrt{s}=130$ GeV is reproduced well with the impact-parameter dependent parton shadowing. However, energy variation of the centrality dependence is needed to distinguish different particle production mechanisms such as the parton saturation model.

6 pages in RevTex format, 5 figures

References in corpus (7)

• 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
• Multiplicity distribution and spectra of negatively charged hadrons in Au+Au collisions at sqrt(s_nn) = 130 GeV
• Determination of nuclear parton distributions
• Parton Energy Loss with Detailed Balance
• Centrality Dependence of Hadron Multiplicities in Nuclear Collisions in the Dual Parton Model
• Enhanced Minijet Production in $A-A$ Collisions from Gluons with Large Transverse Momenta

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