A Study of Transverse Momentum Distributions of Hadrons at LHC

TL;DR

This paper analyzes the transverse momentum distributions of hadrons in central Pb+Pb collisions at LHC energy using a thermal freeze-out model, revealing strong collective flow effects consistent with experimental data.

Contribution

The study applies a unified statistical thermal freeze-out model to LHC data, incorporating hydrodynamic flow and resonance decays, providing new insights into freeze-out conditions and collective behavior.

Findings

Good agreement with ALICE experimental data

Strong collective flow observed in the system

Thermal freeze-out parameters vary with particle species

Abstract

The transverse momentum distributions of various hadrons produced in most central Pb+Pb collisions at LHC energy Root(s_NN) = 2.76 TeV have been studied using our earlier proposed unified statistical thermal freeze-out model. The calculated results are found to be in good agreement with the experimental data measured by the ALICE experiment. The model calculation fits provide the thermal freeze-out conditions in terms of the temperature and collective flow effect parameters for different particle species. Interestingly the model parameter fits reveal a strong collective flow in the system which appears to be a consequence of the increasing particle density at LHC. The model used incorporates a longitudinal as well as transverse hydrodynamic flow. The chemical potential has been assumed to be nearly equal to zero for the bulk of the matter owing to a high degree of nuclear transparency effect at such energies. The contributions from heavier decay resonances are also taken into account in our calculations.