Improved study of a possible Theta+ production in the pp -> p K0 sigma+ reaction with the COSY-TOF spectrometer
TOF collaboration, M. Abdel-Bary, S. Abdel-Samad, K. -Th. Brinkmann, R. Castelijns, H. Clement, J. Dietrich, S. Dshemuchadse, E. Dorochkevitch, W. Eyrich, K. Ehrhardt, A. Erhardt, H. Freiesleben, W. Gast, J. Georgi, A. Gillitzer, H. Jaeger, R. Jaekel, L. Karsch, K. Kilian, M. Krapp, E. Kuhlmann, A. Lehmann, H. P. Morsch, N. Paul, L. Pinna, C. Pizzolotto, J. Ritman, E. Roderburg, S. Schadmand, P. Schoenmeier, M. Schulte-Wissermann, W. Schroeder, T. Sefzick, A. Teufel, A. Ucar, W. Ullrich, R. Wenzel, P. Wintz, P. Wuestner, P. Zupranski
Abstract
The pp -> p K0 Sigma+ reaction was investigated with the TOF spectrometer at COSY at 3.059 GeV/c incident beam momentum. The main objective was to clarify whether or not a narrow exotic S = +1 resnance, the Theta+ pentaquark, is populated at 1.53 GeV/c2 in the K0 p subsystem with a data sample of much higher statistical significance compared to the previously reported data in this channel. An analysis of these data does not confirm the existence of the Theta+ pentaquark. This is expressed as an upper limit for the cross section sigma (pp -> p K0 Sigma+) < 0.15 microbarn at the 95 percent confidence level.
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