Münster 2017 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 59: Heavy Ion Collisions and QCD Phases XII

HK 59.1: Gruppenbericht

Freitag, 31. März 2017, 14:00–14:30, F 3

Strange News from HADES — •Manuel Lorenz for the HADES collaboration — Goethe-Universität Frankfurt

Strangeness production in heavy-ion collisions at energies below the free NN production threshold is an excellent tool to study medium properties of dense baryonic systems. For the first time, a nearly complete set of strange particles has been reconstructed in the 40% most central Au+Au collisions at 1.23A GeV. The multiplicities, together with those for non-strange hadrons, have been analyzed in the context of statistical hadronization models. We find a good agreement between data and model yields, if an additional parameter (Rc) handeling strangeness suppression is included. We find that about 30% of observed K are produced through φ-decay. If the observed K transverse momentum spectra are corrected for feed down from φ, we can fully explain the previously observed differences with respect to the K+. Hence, no need for additional channels like e.g. strangeness exchange reactions are needed to explain the observed differences in inverse slope parameters of charged kaons, supporting also the assumption of a homogenous emission source for all particle types. This work has been supported by BMBF (05P15RFFCA ), GSI and HIC for FAIR.

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