Münster 2002 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 12: Poster Session: Electromagentic and Hadronic Probes

HK 12.24: Poster

Dienstag, 12. März 2002, 10:30–12:45, Foyer Chemie

Hyperon Production in the channel pp → K⁺Λp at COSY-TOF^* — •W. Schroeder, W. Eyrich, M. Fritsch, F. Stinzing, M. Wagner, and S. Wirth — Physikalisches Institut, Universität Erlangen-Nürnberg

The exclusive measurement of hyperon production reactions in proton proton collisions near threshold is one of the main topics at the time-of-flight spectrometer COSY-TOF. For the hyperon program a complex start detector system is used in combination with a segmented stop detector. The setup covers the full phase space and allows the extraction and reconstruction of the reaction pp → K⁺Λp almost without background. The extension of the stop detector by a ring and a barrel-hodoscope to a 3 m version increases the detector efficiency and improves the angular and time-of-flight resolution.

Using this upgraded detector version in a measurement in January 2000 Λ-samples with large statistics were recorded at the two beam momenta of 2.95 and 3.20 GeV/c.

After a short introduction to the analysis methods the preliminary results of these data will be discussed and compared to Λ-data of previous measurements at COSY.

^* supported by BMBF and FZ Jülich