Kinetic freeze-out temperature and flow velocity extracted from transverse momentum spectra of final-state light flavor particles produced in collisions at RHIC and LHC

TL;DR

This study analyzes transverse momentum spectra of light flavor particles from various collisions at RHIC and LHC, extracting kinetic freeze-out temperature and flow velocity using a thermal model, revealing their dependencies on system parameters.

Contribution

It introduces a comprehensive analysis of kinetic freeze-out parameters across different collision systems and energies using a multisource thermal model and statistical fits.

Findings

Kinetic freeze-out temperature increases with system size and energy.

Flow velocity shows a dependence on collision centrality and system size.

Experimental data aligns well with the multi-component Erlang and Tsallis statistical models.

Abstract

The transverse momentum spectra of final-state light flavor particles produced in proton-proton (p-p), copper-copper (Cu-Cu), gold-gold (Au-Au), lead-lead (Pb-Pb), and proton-lead (p-Pb) collisions for different centralities at relativistic heavy ion collider (RHIC) and large hadron collider (LHC) energies are studied in the framework of a multisource thermal model. The experimental data measured by the STAR, CMS, and ALICE Collaborations are consistent with the results calculated by the multi-component Erlang distribution and Tsallis Statistics. The effective temperature and real temperature (kinetic freeze-out temperature) of interacting system at the stage of kinetic freeze-out, the mean transverse flow velocity and mean flow velocity of particles, and the relationships between them are extracted. The dependences of effective temperature and mean (transverse) momentum on rest mass, moving mass, centrality, and center-of-mass energy, and the dependences of kinetic freeze-out temperature and mean (transverse) flow velocity on centrality, center-of-mass energy, and system size are obtained.