A description of the pseudorapidity distributions in heavy ion collisions at RHIC and LHC energies

TL;DR

This paper models pseudorapidity distributions in heavy ion collisions at RHIC and LHC energies using BJP hydrodynamics and Gaussian leading particle distributions, showing good agreement with experimental data.

Contribution

It introduces a combined theoretical approach using BJP hydrodynamics and Gaussian leading particles to describe pseudorapidity distributions in heavy ion collisions.

Findings

The model accurately fits RHIC and LHC experimental data.

Theoretical predictions align well with observed particle distributions.

The approach provides a unified description across different collision energies.

Abstract

The charged particles produced in nucleus-nucleus collisions are classified into two parts,One is from the hot and dense matter created in collisions. The other is from leading particles. The hot and dense matter is assumed to expand and generate particles according to BJP hydrodynamics, a theory put forward by A. Bialas, R. A. Janik and R. Peschanski. The leading particles are argued to possess a Gaussian rapidity distribution with the normalization constant equaling the number of participants. A comparison is made between the theoretical results and the experimental measurements performed by BRAHMS and PHOBOS Collaboration at BNL-RHIC in Au-Au and Cu-Cu collisions at sqrt(s_NN)=200 GeV and by ALICE Collaboration at CERN-LHC in Pb-Pb collisions at sqrt(s_NN) =2.76 TeV. The theoretical results are well consistent with experimental data.