Produced charged hadrons in central Pb + Pb collisions at LHC energies in the RDM

TL;DR

This paper models charged-hadron production in central Pb+Pb collisions at LHC energies using a nonequilibrium relativistic diffusion model, highlighting the dominant role of gluon-gluon interactions at high energies.

Contribution

It introduces a three-source RDM approach to describe energy dependence of hadron production, emphasizing the gluon-gluon source at LHC energies.

Findings

Gluon-gluon source dominates at LHC energies.

The model reproduces pseudorapidity distributions at RHIC and LHC.

Midrapidity dip results from source interplay.

Abstract

The energy dependence of charged-hadron production in relativistic heavy-ion collisions is investigated in a nonequilibrium-statistical relativistic diffusion model (RDM) with three sources. Theoretical pseudorapidity distributions are compared with Au + Au data at RHIC energies of sqrt(s_NN) = 0.13 and 0.2 TeV, and computed for Pb + Pb central collisions at LHC energies of 2.76 and 5.52 TeV. The central, nearly equilibrated source arising from gluon-gluon collisions becomes the major origin of particle production at LHC energies. The midrapidity dip is determined by the interplay of the three sources.