Influence of N*-resonances on hyperon production in the channel pp->K+ Lambda p at 2.95, 3.20 and 3.30 GeV/c beam momentum

COSY-TOF Collaboration: S. AbdEl-Samad , M. Abdel-Bary , K. Brinkmann , H. Clement , J. Dietrich , E. Dorochkevitch , S. Dshemuchadse , K. Ehrhardt

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A. Erhardt W. Eyrich C. Fanara D. Filges A. Filippi H. Freiesleben M. Fritsch W. Gast J. Georgi A. Gillitzer J. Gottwald J. Hauffe D. Hesselbarth H. Jaeger B. Jakob R. Jaekel L. Karsch K. Kilian H. Koch M. Krapp J. Kress E. Kuhlmann A. Lehmann S. Marcello S. Marwinski S. Mauro A. Metzger W. Meyer P. Michel K. Moeller H. Moertel H. P. Morsch L. Naumann N. Paul L. Pinna C. Pizzolotto C. Plettner S. Reimann M. Richter J. Ritman E. Roderburg A. Schamlott P. Schoenmeier M. Schulte-Wissermann W. Schroeder T. Sefzick M. Steinke F. Stinzing G. Sun A. Teufel W. Ullrich J. Waechter G. J. Wagner M. Wagner R. Wenzel A. Wilms P. Wintz S. Wirth P. Wuestner P. Zupranski

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keywords beamdalitzinfluencemomentawerehyperonplotsproduction

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Hyperon production in the threshold region was studied in the reaction pp -> K+Lp using the time-of-flight spectrometer COSY-TOF. Exclusive data, covering the full phase-space, were taken at the three different beam momenta of p_beam=2.95, 3.20 and 3.30 GeV/c, corresponding to excess energies of epsilon=204, 285 and 316 MeV, respectively. Total cross-sections were deduced for the three beam momenta to be 23.9+/-0.8 +/-2.0 ub, 28.4+/-1.3 +/-2.2 ub and 35.0+/-1.3 +/-3.0 ub. Differential observables including Dalitz plots were obtained. The analysis of the Dalitz plots reveals a strong influence of the N(1650)-resonance at p_beam=2.95 GeV/c, whereas for the higher momenta an increasing relative contribution of the N(1710)- and/or of the N(1720)-resonance was observed. In addition, the pL-final-state interaction turned out to have a significant influence on the Dalitz plot distribution.

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Influence of N*-resonances on hyperon production in the channel pp->K+ Lambda p at 2.95, 3.20 and 3.30 GeV/c beam momentum

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