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HK: Fachverband Physik der Hadronen und Kerne

HK 17: Heavy Ion Collision and QCD Phases IV

HK 17.1: Gruppenbericht

Dienstag, 15. März 2016, 14:00–14:30, S1/01 A01

Strangeness Production in Au+Au Collisions at 1.23 AGeV measured with HADES — •Heidi Schuldes for the HADES collaboration — Goethe-Universität Frankfurt

In Au+Au collisions at 1.23 AGeV incident energy all particles carrying open and hidden strangeness are produced below their respective free nucleon-nucleon threshold. As a consequence, the production cross sections is very sensitive to medium effects like momentum distributions, two- or multi-step collisions and modification of the in-medium spectral distribution of the produced states [1]. For the first time at such low energies, a close to complete set of open and hidden strange hadrons has been reconstructed including the following hadron yields: p, π^±, K^±, K⁰, φ, Λ.
In total 7.3 Billion of the 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 differential, acceptance corrected yields and a comparison to yield calculated in SHM. Special emphasis will be on the relative production yields of φ to K⁻.
Supported by BMBF (05P12RFGHJ, 05P15RFFCA), GSI, HIC for FAIR, HGS-HIRe and H-QM.
C.Hartnack et al., Phys. Rept. 510, 119 (2012).