Pseudorapidity distributions of charged particles in pp($\rm\overline{p}$), p(d)A and AA collisions using Tsallis thermodynamics

TL;DR

This paper models charged particle pseudorapidity distributions across various collision systems and energies using Tsallis thermodynamics, successfully fitting experimental data and exploring energy and centrality dependencies.

Contribution

It introduces a fireball model with Tsallis thermodynamics to describe pseudorapidity distributions in diverse collision systems, extending previous models with a unified approach.

Findings

Model fits experimental data well across all systems and energies

Energy and centrality influence fireball distribution parameters

Predicts distributions for future system size scans at RHIC

Abstract

The pseudorapidity distributions of charged particles measured in p+p($\rm \overline{p}$) collisions for energies ranging from $\sqrt{s_{NN}}=23.6$ GeV to 13 TeV, d+Au collisions at $\sqrt{s_{NN}}=200$ GeV, p+Pb collisions at $\sqrt{s_{NN}}= 5.02$ TeV and A+A collisions at RHIC and LHC are investigated in the fireball model with Tsallis thermodynamics. We assume that the rapidity axis is populated with fireballs following q-Gaussian distribution and the charged particles follow the Tsallis distribution in the fireball. The theoretical results are in good agreement with the experimental data for all the collision systems and centralities investigated. The collision energy and centrality dependence of the central position $y_0$ and its width $\sigma$ of the fireball distribution are also investigated. A possible application of the model to predict the charged particle pseudorapidity distributions for the system size scan program proposed recently for the STAR experiment at RHIC is proposed.