Hyperon production in Ar+KCl collisions at 1.76A GeV

TL;DR

This study measures hyperon production in Ar+KCl collisions at 1.76A GeV, analyzing particle spectra, yields, and applying statistical models to understand the chemical freeze-out conditions.

Contribution

It provides new measurements of hyperon spectra and multiplicities, and applies a statistical model to extract freeze-out parameters in heavy-ion collisions.

Findings

Chemical freeze-out temperature T=(76+-2) MeV

Measured Lambda and Xi- hyperon yields

Estimated charged Sigma hyperon multiplicities

Abstract

We present transverse momentum spectra, rapidity distribution and multiplicity of Lambda-hyperons measured with the HADES spectrometer in the reaction Ar(1.76A GeV)+KCl. The yield of Xi- is calculated from our previously reported Xi-/(Lambda+Sigma0) ratio and compared to other strange particle multiplicities. Employing a strangeness balance equation the multiplicities of the yet unmeasured charged Sigma hyperons can be estimated. Finally a statistical hadronization model is used to fit the yields of pi-, K+, K0s, K-, phi, Lambda and Xi-. The resulting chemical freeze-out temperature of T=(76+-2) MeV is compared to the measured slope parameters obtained from fits to the transverse mass distributions of the particles.