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HK: Fachverband Physik der Hadronen und Kerne

HK 16: Hadronenstruktur und -spektroskopie

HK 16.1: Gruppenbericht

Dienstag, 20. März 2012, 16:30–17:00, RW 2

Strangeness with HADES - past, present, future — •Eliane Epple — Excellence Cluster "Universe", 85748 Garching

The HADES collaboration has studied strangeness production at SIS energies in different reactions: from medium-size collision systems (Ar+KCl) to proton induced reactions on heavy nuclei (p+Nb) and elementary reactions (p+p). Depending on the system, strange particles can be used to probe different physics cases.

From the Ar+KCl data sample, the up to now most complete set of strange particle species in the 1-2A GeV energy regime could be measured, including: K_S⁰, K⁺, K⁻, φ, Λ and the deeply sub-threshold Ξ⁻. Also in a p+p run at a beam kinetic energy of 3.5 GeV the reconstruction of several strange particles has been carried out. The Σ(1385)⁺-resonance and the Λ(1405)-resonance have been reconstructed in an exclusive analysis and the investigation of differential K_S⁰ yields, performed previously for Ar+KCl has been continued. The aim hereby is to compare the K_S⁰ production to a p+Nb collision measured at the same beam kinetic energy in context of the kaon nucleon potential. Overall a broad spectrum of measurements will be presented which show the importance of strange probes for understanding the behaviour of nuclear matter and production processes.

In the future of HADES, data from Au+Au and pion-induced reactions will be available and this will allow to continue the differential studies of strangeness under various conditions.