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HK: Fachverband Physik der Hadronen und Kerne
HK 50: Elektromagnetische und Hadronische Sonden
HK 50.3: Talk
Thursday, March 15, 2007, 17:30–17:45, A
Λ Analysis in p-p Reactions with the HADES Spectrometer — •Marco Destefanis for the HADES collaboration — II. Physikalisches Institut, Gießen, Germany
In the year 2004 the HADES experiment, which is part of the GSI facility in Darmstadt, recorded 300 million events of proton-proton collisions at 2.2 GeV beam energy.
Although the design of HADES is optimized for dilepton spectroscopy, also hadron final states can be reconstructed, using the advantages of the large geometrical acceptance and the excellent momentum resolution of HADES. We report preliminary results on Λ production in the Λ → p π− final state. The reaction pp → pK+ Λ is currently under investigation. Remarks on reaction polarization observables using the self-analysing Λ decay will be given. As an outlook, a possible measurement of the timelike form factor in rare decays such as Σ0 → Λ e+ e− will be commented upon.
This work was supported in part by BMBF (06 GI 179), DFG, EGS and GSI.