Hyperon production in Ar + KCl collisions at 1.76A GeV

We present transverse momentum spectra, rapidity distribution and multiplicity of Λ-hyperons measured with the HADES spectrometer in the reaction Ar(1.76A GeV) + KCl. The yield of Ξ− is calculated from our previously reported Ξ−/(Λ+Σ0) ratio and compared to other strange particle multiplicities. Employing a strangeness balance equation the multiplicities of the yet unmeasured Σ± -hyperons can be estimated. Finally a statistical hadronization model is used to fit the yields of π−, K+, K0s , K−, φ, Λ and Ξ−. 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 different particles.