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HK: Fachverband Hadronen und Kerne

HK 67: Poster Session

HK 67.5: Poster

Donnerstag, 19. März 2009, 14:00–16:00, Audi-Max

Strangeness production with WASA-at-COSY^* — •Anna Kowalczyk — Institute of Physics, Jagiellonian University, PL-30059 Cracow, Poland — Institute für Kernphysik and Jülich Center for Hadron Physics, D-52425 Jülich, Germany

The hyperon spectrum is still not understood in detail. In particular the Λ (1405) state has received increased attention recently, since its nature is debated heavily and controversely. Various theoretical investigations predict for this possibly dynamically generated state even a two-pole structure. This calls for detailed investigations of the production cross sections and the decay channels as a function of the excitation energy.

To this aim we have started a feasibility study for measurements of the production and the decay of hyperon states with WASA at COSY. The project starts with the investigation of ground state Σ production in the reaction channel p p → p Σ⁺(1189) K⁰, with the mostly neutral final state involving 3 pions: pp → p Σ⁺ K⁰ → p (pπ⁰) (π⁰π⁰).

The current status of the analysis of data collected in 2008 will be presented.

^* Supported by FZ Jülich, BMBF, and Wallenberg Foundation.