Initial conditions and charged multiplicities in ultra-relativistic heavy-ion collisions

Abstract

At ultra-relativistic energies the minijet production in heavy-ion collisions becomes sensitive to semi-hard parton rescatterings in the initial stages of the process. As a result global characteristics of the event, like the initial minijet density, become rather insensitive on the infrared cutoff that separates hard and soft interactions. This allows to define a nearly parameter-free {\it saturation cutoff} at which the initial conditions may be computed. As an application we study the centrality dependence of the charged particle multiplicity, which is compared with present RHIC data and predicted at higher energies.

10 pages, 3 figures

References in corpus (4)

• 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
• Enhanced Minijet Production in $A-A$ Collisions from Gluons with Large Transverse Momenta

Cited by in corpus (6)

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• Energy and Centrality dependence of $d{N}_{\mathrm{ch}}/d\eta$ and $d{E}_{\mathrm{T}}/d\eta$ in Heavy-Ion Collisions from $\sqrt{s_{\mathrm{NN}}}$ =7.7 GeV to 5.02 TeV
• Centrality and $\sqrt{s_{NN}}Dependenceofthe$dE_{T}/dη$and$dN_{ch}/dη$ in Heavy Ion Collisions at Mid-Rapidity
• An interpretation of saturation phenomena as Glauber-Gribov multiple parton scatterings
• Rapidity and centrality dependence in the percolating colour strings scenario