Abstract.
We present transverse momentum spectra, rapidity distribution and multiplicity of \( \Lambda\) -hyperons measured with the HADES spectrometer in the reaction Ar(1.76AGeV) + KCl . The yield of \( \Xi^{{-}}_{}\) is calculated from our previously reported \( \Xi^{{-}}_{}\)/(\( \Lambda\) + \( \Sigma^{{0}}_{}\)) ratio and compared to other strange particle multiplicities. Employing a strangeness balance equation the multiplicities of the yet unmeasured \( \Sigma^{{\pm}}_{}\) -hyperons can be estimated. Finally a statistical hadronization model is used to fit the yields of \( \pi^{-}_{}\) , K+, K 0 s , 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 different particles.
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The HADES Collaboration., Agakishiev, G., Balanda, A. et al. Hyperon production in Ar + KCl collisions at 1.76A GeV. Eur. Phys. J. A 47, 21 (2011). https://doi.org/10.1140/epja/i2011-11021-8
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DOI: https://doi.org/10.1140/epja/i2011-11021-8