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arXiv · 1003.0603

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

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

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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TOF Collaboration, S. AbdEl-Samad, M. Abdel-Bary, K. Brinkmann, H. Clement, J. Dietrich, E. Dorochkevitch, S. Dshemuchadse, K. Ehrhardt, 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. 2010-03-02. 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. https://doi.org/10.1016/j.physletb.2010.03.076

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