Improved study of a possible Theta+ production in the pp -> p K0 sigma+ reaction with the COSY-TOF spectrometer

COSY-TOF collaboration , M. Abdel-Bary , S. Abdel-Samad , K.-Th. Brinkmann , R. Castelijns , H. Clement , J. Dietrich , S. Dshemuchadse

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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

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classification ✦ hep-ex

keywords sigmadatathetapentaquarkreactionspectrometeranalysisbeam

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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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Improved study of a possible Theta+ production in the pp -> p K0 sigma+ reaction with the COSY-TOF spectrometer

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