Search for narrow NNπ resonances in exclusive pp→ppπ+π− measurements
/ Authors
W. Brodowski, J. Paetzold, R. Bilger, H. Calén, H. Clement, C. Ektrom, K. Fransson, J. Greiff, S. Haggstrom, B. Hoistad
and 19 more authors
J. Johanson, A. Johansson, T. Jóhannsson, K. Kilian, S. Kullander, A. Kupsc, P. Marciniewski, B. Morosov, W. Oelert, R. Ruber, M. Schepkin, W. Scobel, J. Stepaniak, A. Sukhanov, A. Turowiecki, G. Wagner, Z. Wilhelmi, J. Zabierowski, J. Zlomanczuk
/ Abstract
Abstract Narrow structures in the range of a few MeV have been searched for in ppπ + and ppπ − invariant mass spectra ( M ppπ + and M ppπ − ) obtained from exclusive measurements of the pp → ppπ + π − reaction at T p =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/ c 2 m dibaryon c 2 no narrow structures could be identified on the 3 σ level of statistical significance neither in M ppπ − nor in M ppπ + giving an upper limit (95% C.L.) for dibaryon production in this reaction of σ
Journal: Physics Letters B