Measurements of midrapidity charged particle multiplicity distributions, dN ch /dη, and midrapidity transverse-energy distributions, dET /dη, are presented for a variety of collision systems and energies. Included are distributions for Au+Au collisions at For all A+A collisions down to √ s N N = 7.7 GeV, it is observed that the midrapidity data are better described by scaling withNqp than scaling with Npart. Also presented are estimates of the Bjorken energy density, εBJ, and the ratio of dET /dη to dN ch /dη, the latter of which is seen to be constant as a function of centrality for all systems.
Abstract. 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+Σ 0 ) 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 πThe 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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