Hyperon production in the threshold region was studied in the reaction pp→K+Λp using the time-of-flight spectrometer COSY-TOF. Exclusive data, covering the full phase-space, were taken at three different beam momenta pbeam=2.59, 2.68 and 2.85 GeV/c (corresponding to excess energies of var epsilon=85, 115 and 171 MeV). Total cross-sections were deduced to be 7.4±0.5 μb, 8.6±0.6 μb and 16.5±0.4 μb, respectively. Differential observables including Dalitz plots were obtained. From the investigation of the Dalitz plot at pbeam=2.85 GeV/c a dominant contribution of the N*(1650)-resonance to the reaction mechanism was found. In addition the pΛ-final-state interaction turned out to have a significant influence on the Dalitz plot distribution even 171 MeV above threshold.

Hyperon production in the channel p p --> K+ Lambda p near the reaction threshold

MARCELLO, Simonetta;
2006-01-01

Abstract

Hyperon production in the threshold region was studied in the reaction pp→K+Λp using the time-of-flight spectrometer COSY-TOF. Exclusive data, covering the full phase-space, were taken at three different beam momenta pbeam=2.59, 2.68 and 2.85 GeV/c (corresponding to excess energies of var epsilon=85, 115 and 171 MeV). Total cross-sections were deduced to be 7.4±0.5 μb, 8.6±0.6 μb and 16.5±0.4 μb, respectively. Differential observables including Dalitz plots were obtained. From the investigation of the Dalitz plot at pbeam=2.85 GeV/c a dominant contribution of the N*(1650)-resonance to the reaction mechanism was found. In addition the pΛ-final-state interaction turned out to have a significant influence on the Dalitz plot distribution even 171 MeV above threshold.
2006
632
27
34
proton-proton collisions; hyperons; hadronic physics; strong interaction; cross sections
S. Abd El-Samad; R. Bilger; A. Böhm; K.-Th. Brinkmann; H. Clement; S. Dshemuchadse; W. Eyrich; A. Erhardt; C. Fanara; A. Filippi; H. Freiesleben; M. Fritsch; R. Geyer; J. Hauffe; A. Hassan; P. Herrmann; D. Hesselbarth; B. Jakob; K. Kilian; H. Koch; J. Kress; E. Kuhlmann; S. Marcello; S. Marwinski; A. Metzger; P. Michel; K. Möller; H.P. Morsch; L. Naumann; E. Roderburg; A. Schamlott; P. Schönmeier; M. Schulte-Wissermann; W. Schroeder; M. Steinke; F. Stinzing; G.Y. Sun; J. Wächter; G.J. Wagner; M. Wagner; A. Wilms; S. Wirth; U. Zielinski
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/7313
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