Hyperon productions from Au+Au collisions at $\sqrt{s_{NN}}$=200 GeV

TL;DR

This paper investigates how hyperon and meson yields depend on collision centrality in Au+Au collisions at 200 GeV, revealing increased multistrange production and freeze-out behaviors near the critical temperature.

Contribution

It introduces a microscopic analysis of hyperon yields using rate and Boltzmann equations, comparing results with experimental data and highlighting multistrange hyperon freeze-out near T_c.

Findings

Yield per participant increases with centrality.

Multistrange hyperons are produced more in central collisions.

Hyperons freeze out near the critical temperature T_c.

Abstract

We evaluate centrality dependence of hyperon, $\Lambda, \Xi, \Omega$ and $K$ meson yields from Au+Au collisions at $\sqrt{s_{NN}}$=200 GeV using rate equation and compare with experimental observations. An increase in the yield per participating nucleon is observed with centrality. Higher rate of multistrange productions compared to single-strange are also observed in case of central collisions. Using rate equation or momentum integrated Boltzmann equation we discuss the yield microscopically which are then normalised with thermal pions to get the yield ratio,($H_s+\bar{H_s}$)/($\pi^++\pi^-$) at various centralities. We have also evaluated the relative yield of anti hyperons per participant at various centralities and compared with observations made at RHIC. Increase in the rate of $\Xi$ yield compared to $\Lambda$ is realised in most central collisions. We find multi strange $\Xi,\Omega$ freeze-out at a temperature very close to $T_c$ and $\Lambda, K$ do little later.