Speaker
Ms
Heidi Schuldes
(Goethe-University Frankfurt)
Description
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,
since only 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 R$_c$ in these models, and therefore the ratio of $\phi$/K$^-$ is predicted to rise with
decreasing beam energies and as a consequence the feed-down of $\phi$-mesons to kaons becomes important.
In total 7.3 Billion 40% most central Au(1.23 GeV per nucleon)+Au collisions have been analyzed for this investigation. The data has been recorded with HADES and a substantially improved reconstruction method has been employed to reconstruct the hadrons with high purity in a wide phase space region. In this contribution, we present results on charged kaons and $\phi$-mesons.
Supported by BMBF (05P12RFGHJ), HIC for FAIR, HGS-HIRe, H-QM and GSI.
| On behalf of collaboration: | HADES |
|---|
Primary author
Ms
Heidi Schuldes
(Goethe-University Frankfurt)
