Improved study of a possible Theta+ production in the pp -&gt; pK0 Sigma+ reaction with the COSY-TOF spectrometer

Abdel-Bary, M.; Lehmann, A.; Pinna, L.; Clement, H.; Teufel, A.; Abdel-Samad, S.; Georgi, J.; Gillitzer, A.; Kuhlmann, E.; Dietrich, J.; Freiesleben, H.; Doroshkevich, E.; Ritman, J.; Roderburg, E.; Schulte-Wissermann, M.; Brinkmann, K. T.; Zupranski, P.; Schadmand, S.; Morsch, H.-P.; Erhardt, A; Castelijns, R.; Sefzick, T.; Gast, W.; Ucar, A.; Schönmeier, P.; Eyrich, W.; Karsch, L.; Wüstner, P.; Schröder, W.; Krapp, M.; Paul, N.; Pizzolotto, C.; Dshemuchadse, S.; Ehrhardt, K.; Kilian, K.

doi:10.1016/j.physletb.2007.04.023

Journal Article

Improved study of a possible Theta+ production in the pp -> pK0 Sigma+ reaction with the COSY-TOF spectrometer

Abdel-Bary, M.FZJ* ; Abdel-Samad, S.FZJ* ; Brinkmann, K. T. ; Castelijns, R.FZJ* ; Clement, H. ; Dietrich, J. ; Doroshkevich, E. ; Dshemuchadse, S. ; Ehrhardt, K. ; Erhardt, A. ; Eyrich, W. ; Freiesleben, H. ; Gast, W.FZJ* ; Georgi, J. ; Gillitzer, A.FZJ* ; Karsch, L. ; Kilian, K.FZJ* ; Krapp, M. ; Kuhlmann, E.FZJ* ; Lehmann, A.FZJ* ; Morsch, H.-P.FZJ* ; Paul, N.FZJ* ; Pinna, L. ; Pizzolotto, C. ; Ritman, J.FZJ* ; Roderburg, E.FZJ* ; Schadmand, S.FZJ* ; Schönmeier, P. ; Schröder, W.FZJ* ; Schulte-Wissermann, M. ; Sefzick, T.FZJ* ; Teufel, A.FZJ* ; Ucar, A.FZJ* ; Wüstner, P.FZJ* ; Zupranski, P.FZJ*

2007
North-Holland Publ. Amsterdam

Physics letters / B 649, 252 - 257 (2007) [10.1016/j.physletb.2007.04.023]

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Please use a persistent id in citations: http://hdl.handle.net/2128/10539 doi:10.1016/j.physletb.2007.04.023

Abstract: The pp -> pK(0)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 resonance, the Theta+ pentaquark, is populated at 1.53 GeV/c(2) in the pK0 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 -> Z+ Theta+) < 0.15 mu b at the 95% confidence level. (C) 2007 Elsevier B.V. All rights reserved.

Keyword(s): p p: exclusive reaction ; K0: hadroproduction ; Sigma+: associated production ; pentaquark: hadroproduction ; Theta(1540) ; mass spectrum: (p K0) ; channel cross section: upper limit ; spectrometer: time-of-flight ; experimental results ; Juelich COSY PS ; p p --> Sigma+ p K0 ; p p --> Theta(1540) Sigma+ ; 3.059 GeV/c: (1)