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Search for narrow NNπ resonances in exclusive pp→ppππ measurements |
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| Institution: | a Physikalisches Institut der Universität Tübingen, Morgenstelle 14, D-72076, Tübingen, Germany b The Svedberg Laboratory, S-751 21, Uppsala, Sweden c Department of Radiation Sciences, Uppsala University, S-751 21, Uppsala, Sweden d I. Institut für Experimentalphysik der Universität, Hamburg, Germany e IKP, Forschungszentrum Jülich GmbH, D-52425, Jülich, Germany f Joint Institute for Nuclear Research, Dubna, 101000, Moscow, Russia g Institute for Theoretical and Experimental Physics, 117218, Moscow, Russia h Soltan Institute for Nuclear Studies, PL-00681, Warsaw, Poland i Institute of Experimental Physics, Warsaw University, PL-00681, Warsaw, Poland j Soltan Institute for Nuclear Studies, PL-90137, Lódz, Poland |
| Abstract: | Narrow 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. |
| Keywords: | Dibaryon NNπ resonance |
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