1. Improved study of a possible Theta+ production in the pp -> pK0 Sigma+ reaction with the COSY-TOF spectrometer
- Author
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collaboration, COSY-TOF, Abdel-Bary, M., Abdel-Samad, S., Brinkmann, K. -Th., Castelijns, R., Clement, H., Dietrich, J., Dshemuchadse, S., Dorochkevitch, E., Eyrich, W., Ehrhardt, K., Erhardt, A., Freiesleben, H., Gast, W., Georgi, J., Gillitzer, A., Jaeger, H., Jaekel, R., Karsch, L., Kilian, K., Krapp, M., Kuhlmann, E., Lehmann, A., Morsch, H. P., Paul, N., Pinna, L., Pizzolotto, C., Ritman, J., Roderburg, E., Schadmand, S., Schoenmeier, P., Schulte-Wissermann, M., Schroeder, W., Sefzick, T., Teufel, A., Ucar, A., Ullrich, W., Wenzel, R., Wintz, P., Wuestner, P., and Zupranski, P.
- Subjects
exclusive reaction [p p] ,(1) [3.059 GeV/c] ,hadroproduction [K0] ,upper limit [channel cross section] ,associated production [Sigma+] ,time-of-flight [spectrometer] ,Juelich COSY PS ,High Energy Physics - Experiment ,(p K0) [mass spectrum] ,+Sigma%2B+p+K0%22">p p --> Sigma+ p K0 ,ddc:530 ,hadroproduction [pentaquark] ,Theta(1540) ,+Theta%281540%29+Sigma%2B%22">p p --> Theta(1540) Sigma+ ,experimental results - 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., Comment: 11 pages, 5 figures
- Published
- 2007
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