Microscopic study of strange hadron productions at the LHC with$\sqrt{s_{NN}}$=2.76 TeV

TL;DR

This paper microscopically studies strange hadron production in Pb-Pb collisions at 2.76 TeV using rate equations, comparing results with LHC data to understand freeze-out conditions of different strange particles.

Contribution

It introduces a microscopic rate equation approach considering hadronic cross sections to evaluate strange hadron yields at LHC energies, highlighting species-specific freeze-out behaviors.

Findings

Strange hadrons freeze out near the critical temperature at LHC energy.

Different strange hadron species exhibit slightly different freeze-out temperatures.

Model results agree with experimental measurements across various multiplicities.

Abstract

Ratio of the yield of strange hadrons to pions is considered as an important observable in studying the properties of the system produced in relativistic heavy ion collisions. Production of strange hadrons $K, \bar{K}, \Lambda, \Sigma, \Xi$ and $\Omega$ have been evaluated microscopically using rate equations by considering their hadronic interaction cross sections in an expanding medium. The yields obtained from rate equations are normalized with thermal pions and compared with the measurements from Pb-Pb collisions at various multiplicities at LHC energy. The calculation has been done for various initial and freeze out conditions. At 2760 GeV, LHC energy, $\Lambda, \Xi, \Omega$ freeze out close to $T_C$ and $K^0_s$ freezes out little later. But there is a subtle difference in freeze out temperatures of different species which may be distinguishable at lower colliding energies.