Bochum 2009 – scientific programme
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HK: Fachverband Hadronen und Kerne
HK 55: Heavy Ion Collisions and QCD phases
HK 55.1: Group Report
Wednesday, March 18, 2009, 16:30–17:00, H-ZO 10
Strangeness Production in Heavy Ion Collisions close to Threshold with HADES — •Alexander Schmah — Technische Universität München
For the first time, at SIS energies, the combined and inclusive identification of sub-threshold
produced K+, K− and φ-mesons was carried out. These data refer to the reaction Ar+KCl
at kinetic beam energy of 1.756 AGeV, measured by the HADES collaboration. It will be demonstrated
that the mesons are reconstructed with high purity. The same data also provide full phase space distributions
for Ks0-mesons and Λ-hyperons and an estimate of the not measured Σ-hyperons relying on
strangeness balance. The result is compared to previous published data [1].
The transverse momentum distributions, rapidity distributions and multiplicities of the kaons
(K+, K−) and φ-mesons are compared to previous measurement showing a nice agreement
of the data with the available systematics [2]. The high statistics and quality of the
Ks0 data allows studying of the low momentum region, which is supposed to be sensitive to the
kaon-nucleon potential. The data are compared with theoretical models.
Supported by HGF and Excellence Cluster Universe.
A. Foerster et al., arXiv:nucl-ex 0701014v1.
M. Merschmeyer et al., Phys. Rev. C 6 (2007) 145.