Statistical Thermal Model for Particle Production in pp Collisions at RHIC and LHC Energies

Jiayu Chen,Baochun Li,Hongwei Dong,Xinjian Wen

doi:10.3390/universe8020124

Abstract

In this paper, an improved multi-source thermal model is used to analyze the transverse momentum spectra in pp collisions at high energies, ranging from sNN = 62.4 GeV to 7 TeV. Via a detailed comparison between the model results and experimental data at RHIC and LHC energies, the thermodynamic properties of particle production are decided. It is shown that the excitation factors of emission sources depend linearly on lnsNN in the framework. Based on the variation regularity of the source excitation factors, transverse momentum spectra are predicted in pp collisions at higher energies; potential future pp colliders operating at sNN = 33 and 100 TeV.

Highlights

Inclusive measurements of produced particle spectra in high-energy pp collisions can provide an insight into thermodynamic properties and the strong interaction in lowenergy, non-perturbative region of quantum chromodynamics (QCD) [1,2]
Final-state particles are emitted from thermalized sources, which are located in a projectile cylinder, and a target cylinder is created in pp collisions
In order to identify the validity of the updated model, the pseudorapidity spectrum of produced particles is obtained by Equation (5) and Figure 1 prese√nts the pseudorapidity distributions of charged particles produced in pp collisions at sNN = 200 GeV

Summary

Introduction

Inclusive measurements of produced particle spectra in high-energy pp collisions can provide an insight into thermodynamic properties and the strong interaction in lowenergy, non-perturbative region of quantum chromodynamics (QCD) [1,2]. Considering the creation and subsequent decay of hadronic resonances produced in chemical equilibrium at a certain temperature and baryon chemical potential, statistical thermal models have obtained some valuable thermodynamic information of the mutiparticle system in high- energy collisions in the past few years. It is an identifying feature of the thermal models that these resonances listed by the Particle Data Group (PDG) are considered to be in a thermal and chemical equilibrium [5]. The improved model is used to analyse the transverse momentum spectra in pp collisions at RHIC and LHC energies

The Statistical Thermal Model

PTij exp

Discussion and Conclusions