Strange and Multi-strange Particle Production in Au+Au Collisions at $\sqrt{s_{NN}}$ = 62.4 GeV

TL;DR

This paper reports on the production of strange and multi-strange particles in gold-gold collisions at 62.4 GeV, analyzing spectra, yields, and ratios to understand chemical freeze-out and medium effects, with results comparable to higher energy collisions.

Contribution

It provides detailed measurements of strange particle production at 62.4 GeV and explores their implications for chemical freeze-out and medium modifications in heavy-ion collisions.

Findings

Particle yields follow a smooth energy dependence.

Chemical freeze-out parameters are extracted from yields.

Centrality dependence resembles higher energy collisions.

Abstract

We present results on strange and multi-strange particle production in Au+Au collisions at $\sqrt{s_{NN}}=62.4$ GeV as measured with the STAR detector at RHIC. Mid-rapidity transverse momentum spectra and integrated yields of $K^{0}_{S}$, $\Lambda$, $\Xi$, $\Omega$ and their anti-particles are presented for different centrality classes. The particle yields and ratios follow a smooth energy dependence. Chemical freeze-out parameters, temperature, baryon chemical potential and strangeness saturation factor obtained from the particle yields are presented. Intermediate transverse momentum ($p_T$) phenomena are discussed based on the ratio of the measured baryon-to-meson spectra and nuclear modification factor. The centrality dependence of various measurements presented show a similar behavior as seen in Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV.