Search for Narrow NNpi Resonances in Exclusive p p -> p p pi+ pi- Measurements
W. Brodowski, J. Paetzold, R. Bilger, H. Calen, H. Clement, C. Ektrom, K. Fransson, J. Greiff, S. Haggstrom, B. Hoistad, J. Johanson, A. Johansson, T. Johannsson, K. Kilian, S. Kullander, A. Kupsc, P. Marciniewski, B. Morosov, W. Oelert, R. J. M. Y. Ruber, M. Schepkin, W. Scobel, J. Stepaniak, A. Sukhanov, A. Turowiecki, G. J. Wagner, Z. Wilhelmi, J. Zabierowski, J. Zlomanczuk
Abstract
Narrow structures in the range of a few MeV have been searched for in p p pi+ and p p pi- invariant mass spectra obtained from exclusive measurements of the p p -> p p pi+ pi- reaction at Tp = 725, 750 and 775 MeV using the PROMICE/WASA detector at CELSIUS. The selected reaction is particularily well suited for the search for NN and / or N Delta decoupled dibaryon resonances. Except for a possible fluctuation at 2087 MeV/c2 in Mpppi- no narrow structures could be identified neither in Mpppi+ nor in Mpppi- on the 3 sigma level of statistical significance, giving an upper limit (95% C.L.) for dibaryon production in this reaction of sigma < 20 nb for 2020 MeV/c2 < m(dibaryon) < 2085 MeV/c2
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