Improved study of a possible Θ+ production in the pp→pK0Σ+ reaction with the COSY-TOF spectrometer

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 (+28 others)
2007 Physics Letters B  
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
more » ... upper limit for the cross section sigma (pp -> p K0 Sigma+) < 0.15 microbarn at the 95 percent confidence level.
doi:10.1016/j.physletb.2007.04.023 fatcat:vwnqooqn7zct5ccjss6ylugnme