Gießen 2007 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 50: Elektromagnetische und Hadronische Sonden
HK 50.2: Talk
Thursday, March 15, 2007, 17:15–17:30, A
Analysis of the reactions pp→ pK+Λ and pp→ pK+Σ0 at excess energies of 150 MeV* — •J. Dietrich, K.-T. Brinkmann, S. Dshemuchadse, H. Freiesleben, L. Karsch, E. Kuhlmann, M. Schulte-Wissermann, W. Ullrich, and R. Wenzel for the COSY-TOF collaboration — Institut für Kern- und Teilchenphysik, 01069 Dresden, Deutschland
One of the main issues of the COSY–TOF collaboration is the measurement of hyperon production in proton-proton interactions. The reactions pp→ pK+Λ and pp→ pK+Σ0 were studied at beam momenta of pbeam = 2950 MeV/c and 3065 MeV/c. The analysis is based on the reconstruction of the velocity vectors of all charged particles which allows the kinematically complete reconstruction of the missing neutral particle. Using a new and improved track reconstruction algorithm both reaction channels can be separated clearly via their missing mass. For both channels total and differential cross sections are determined, where the differential data for the Σ0-channel are new to the world data set. In view of these data, different models for associated strangeness production will be discussed and the influence of the N*–resonances will be pointed out.
* supported by BMBF and FZ-Jülich