Improved study of a possible Θ+ production in the pp→pK0Σ+ reaction with the COSY-TOF spectrometer
/ Authors
COSY-TOF collaboration, M. Abdel-Bary, S. Abdel-Samad, K. Brinkmann, R. Castelijns, H. Clement, J. Dietrich, S. Dshemuchadse, E. Dorochkevitch, W. Eyrich
and 31 more authors
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. 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. Żupránski
/ Abstract
Abstract The p p → p K 0 Σ + 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 resonance, the Θ + pentaquark, is populated at 1.53 GeV / c 2 in the p K 0 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 Θ + pentaquark. This is expressed as an upper limit for the cross section σ ( p p → Σ + Θ + ) 0.15 μb at the 95% confidence level.
Journal: Physics Letters B