COSY-TOF Research on Theta+

Eyrich, W.; Morsch, H. P.; Naumann, L.; Pinna, L.; Meyer, W.; Filippi, L. V.; Mörtel, H.; Clement, H.; Stinzing, F.; Jäkel, R.; Schulter-Wissermann, M.; Abdel-Samad, S.; Wirth, S.; Georgi, J.; Kuhlmann, E.; Möller, K.; Schönmeier, P.; Pizzolotto, L.; Freiesleben, H.; Doroshkevich, E.; Wilms, A.; Abdel-Bary, M.; Zupranski, P.; Karsch, L.; Gillitzer, C. G.; Michel, P.; Sefzick, T.; Dutz, H.; Ucar, A.; Marcello, S.; Wagner, M.; Brinkmann, K.; Wüstner, P.; Dshemuchadse, S.; Erhardt, A.; Gonser, M. A.; Schröder, W.; Schamlott, A.; Roderburg, E.; Steinke, M.; Fritsch, M.; Ullrich, W.; Kreß, J.; Sun, G. Y.; Wintz, P.; Koch, H.; Ehrhardt, K.; Wagner, G. J.; Kilian, K.

Journal Article

COSY-TOF Research on Theta+

Eyrich, W. ; Brinkmann, K. ; Abdel-Bary, M.FZJ* ; Abdel-Samad, S.FZJ* ; Clement, H. ; Doroshkevich, E. ; Dshemuchadse, S. ; Dutz, H. ; Ehrhardt, K. ; Erhardt, A. ; Filippi, L. V. ; Freiesleben, H. ; Fritsch, M. ; Georgi, J. ; Gillitzer, C. G.FZJ* ; Gonser, M. A. ; Jäkel, R. ; Karsch, L. ; Kilian, K.FZJ* ; Koch, H. ; Kreß, J. ; Kuhlmann, E.FZJ* ; Marcello, S. ; Meyer, W. ; Michel, P. ; Morsch, H. P.FZJ* ; Möller, K. ; Mörtel, H. ; Naumann, L. ; Pinna, L. ; Pizzolotto, L. ; Roderburg, E.FZJ* ; Schamlott, A. ; Schönmeier, P. ; Schröder, W. ; Schulter-Wissermann, M. ; Sefzick, T.FZJ* ; Steinke, M. ; Stinzing, F. ; Sun, G. Y. ; Ucar, A.FZJ* ; Ullrich, W. ; Wagner, G. J. ; Wagner, M. ; Wilms, A. ; Wintz, P.FZJ* ; Wirth, S. ; Wüstner, P.FZJ* ; Zupranski, P.

2005
Inst. of Physics, Jagellonian Univ. Cracow

Acta physica Polonica / B 36, 2189 (2005)

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Please use a persistent id in citations: http://hdl.handle.net/2128/1662

Abstract: Using the TOF detector at the COSY storage ring the hadronic reaction pp -> Sigma(+)K(0)p was measured exclusively at a beam momentum of 2.95 GeV/c. A narrow peak was observed in the invariant mass spectrum of the K(0)p subsystem at 1530 +/- 15 McV/c(2) with a significance of 4-6 standard deviations, depending on background assumptions. The upper limit of 18 +/- 4 MeV/c(2) (FWHM) for its width is given by the experimental resolution. Since a resonance in this subsystem must have strangeness S = +1 we claim it to be the Theta(+) state for which very recently evidence was found in various experiments. To come to a final decision on the existence of the Theta(+) very recently COSY-TOF performed a measurement which will give results with strongly improved statistical accuracy.

Keyword(s): J

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