Abstract
We present first data on sub-threshold production of Ks0 mesons and Λ hyperons in Au+Au collisions at sNN=2.4 GeV. We observe an universal 〈Apart〉 scaling of hadrons containing strangeness, independent of their corresponding production thresholds. Comparing the yields, their 〈Apart〉 scaling, and the shapes of the rapidity and the pt spectra to state-of-the-art transport model (UrQMD, HSD, IQMD) predictions, we find that none of them can simultaneously describe these observables with reasonable χ2 values.
Highlights
HADES CollaborationWe compare the scaling of the multiplicities as function of the centrality of the collisions to the previously published data on charged kaons and φ mesons [29] and the spectra and rapidity distributions to predictions from three state-of-the-art microscopic transport models (UrQMD, HSD, IQMD) [30,31,32]
Further model refinements and data-to-model comparisons based on additional observables e.g. directed flow of strange hadrons are necessary before firm constraints can be deduced
Summary
We compare the scaling of the multiplicities as function of the centrality of the collisions to the previously published data on charged kaons and φ mesons [29] and the spectra and rapidity distributions to predictions from three state-of-the-art microscopic transport models (UrQMD, HSD, IQMD) [30,31,32]. Based on this we discuss the validity of the previously drawn conclusions about the K-N potential and the energy dissipation during the collision in light of the new data.
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