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

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.

Purabi Ghosh, Jajati K. Nayak, Sushant K. Singh, Santosh K. Agarwalla · 2019