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Heidelberg 2015 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 15: Heavy Ion Collisions and QCD Phases 2

HK 15.4: Talk

Monday, March 23, 2015, 18:00–18:15, T/HS1

Charged kaon and φ reconstruction in Au+Au-collisions at 1.23 AGeV — •Heidi Schuldes for the HADES collaboration — Goethe-Universität Frankfurt

In Au+Au-collisions at 1.23 AGeV incident energy, strangeness is produced below the free nucleon-nucleon threshold. In baryon dominated matter K+ and K mesons exhibit different properties, because K can be resonantly absorbed by nucleons.
Although strangeness exchange reactions have been proposed to be the dominant channel for K production in this energy regime, the production yield could also be explained in Ar+KCl-reactions at 1.76 AGeV based on a statistical hadronization model fit to the measured particle yields. To guarantee strangeness conservation, strangeness is calculated canonically within Rc in these models, and therefore the ratio of φ/K is predicted to rise with decreasing beam energies and as a consequence the feed-down of φ-mesons to kaons becomes important.
In 2012, 7.3 billion Au(1.23 GeV per nucleon)+Au collisions have been recorded by the HADES detector. In this contribution, we present results on charged kaons and φ mesons.
Supported by BMBF (05P12RFGHJ), GSI, HIC for FAIR, HGS-HIRe and H-QM.

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