Search for narrow NNπ resonances in exclusive pp→ppπ+π− measurements
- Brodowski, W
- Pätzold, J
- Bilger, R
- Calén, H
- Clement, H
- Ekström, C
- Fransson, K
- Greiff, J
- Häggström, S
- Höistad, B
- Johanson, J
- Johansson, A
- Johansson, T
- Kilian, K
- Kullander, S
- Kupść, A
- Marciniewski, P
- Morosov, B
- Oelert, W
- Ruber, R.J.M.Y
- Schepkin, M
- Scobel, W
- Stepaniak, J
- Sukhanov, A
- Turowiecki, A
- Wagner, G.J
- Wilhelmi, Z
- Zabierowski, J
- Zlomanczuk, J
Publication date
December 2002
DOI Publisher
Elsevier Science B.V. ISSN
0370-2693Abstract
AbstractNarrow structures in the range of a few MeV have been searched for in ppπ+ and ppπ− invariant mass spectra (Mppπ+ and Mppπ−) obtained from exclusive measurements of the pp→ppπ+π− reaction at Tp=725,750 and 775 MeV using the PROMICE/WASA detector at CELSIUS. The selected reaction is particularly well suited for the search for dibaryon resonances decoupled from NN and/or NΔ. In the mass range 2020 MeV/c2<mdibaryon<2085 MeV/c2 no narrow structures could be identified on the 3σ level of statistical significance neither in Mppπ− nor in Mppπ+ giving an upper limit (95% C.L.) for dibaryon production in this reaction of σ<20 nb
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