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Search for narrow N N pi resonances in exclusive p p ---> p p pi+ pi- measurements

Brodowski, W. (Tubingen U.) ; Patzold, J. (Tubingen U.) ; Bilger, R. (Tubingen U.) ; Calen, H. ; Ekstrom, Curt ; Fransson, K. ; Greiff, J. ; Haggstrom, S. ; Hoistad, B. ; Johanson, J. ; Johansson, A. ; Johansson, T. ; Kilian, K. ; Kullander, S. ; Kupsc, 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.

Published in: Phys.Lett.
Year: 2002
Vol.: B550
Page No: 147-153
Pages: 9

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/c^2 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/c^2 < m(dibaryon) < 2085 MeV/c^2

Web-Page: http://www.adsabs.harvard.edu/abs/2002PhLB..550..147B; http://alice.cern.ch/format/showfull?sysnb=2322858; http://www.sciencedirect.com/science?_ob=GatewayURL&_origin=SPIRES&_method=citationSearch&_volkey=03702693%23550%23147&_version=1&md5=163842bea7ca7c3e5649bd266f40b98d; http://www.sciencedirect.com/web-editions?_ob=GatewayURL&_origin=SPIRES&_method=citationSearch&_volkey=03702693%23550%23147&_version=1&md5=163842bea7ca7c3e5649bd266f40b98d

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