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HK: Physik der Hadronen und Kerne

HK 12: Poster Session: Electromagentic and Hadronic Probes

HK 12.23: Poster

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

Investigation of the reaction pp → nK⁺Σ⁺ — •Peter Schönmeier — Institut für Kern- u. Teilchenphysik, Technische Universität Dresden *

Reactions of the type pp → NKY are presently studied at COSY in very detail, in particular the channels Y = (Λ,Σ ⁰). Data on Σ ⁺, Σ ⁻ are not known close to threshold. The COSY-TOF spectrometer complemented by the neutron detector COSYnus provides access to the nK⁺Σ⁺ channel. Its identification is rendered possible by the detection of a neutron, kaon, and Σ ⁺ → nπ⁺, pπ⁰ decay which results, in general, in an angle between the tracks of the charged primary and secondary particle. However, one neutral particle remains undetected. Hence, control of the large background due to pp → npπ ⁺ reactions is of utmost importance in order to obtain a clear nK⁺Σ⁺-signal. We present first results from a measurement performed at a beam momentum of 2.85 GeV/c.

^* supported by BMBF and FZJ