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Skorodko, T.; Bashkanov, M.; Bogoslawsky, D.; Calen, H.; Cappellaro, F.; Clement, H.; Demiroers, L.; Doroshkevich, E.; Duniec, D.; Ekström, C.; Franssen, K.; Gustafsson, L.; Höistad, B.; Ivanov, G.; Jacewicz, M.; Jiganov, E.; Johansson, T.; Khakimova, O.; Kaskulov, M.; Keleta, S.; Koch, I.; Kren, F.; Kullander, S.; Kupść, A.; Kuznetsov, A.; Marciniewski, P.; Meier, R.; Morosov, B.; Pauly, C.; Petterson, H.; Petukhov, Y.; Povtorejko, A.; Schönning, K.; Scobel, W.; Shwartz, B.; Sopov, V.; Stepeniak, J.; Thörngren-Engblom, P.; Tikhomirov, V.; Wagner, G. J.; Wolke, M.; Yamamoto, A.; Zabierowski, J.; Złomanczuk, J.
The European physical journal. A, Hadrons and nuclei, 03/2008, Letnik: 35, Številka: 3Journal Article
. In most investigations the Roper resonance is sensed only very indirectly via complex partial-wave analyses. We find indications for its excitation in the invariant n π + mass spectrum of the pp → np π + reaction at M ≈ 1360 MeV with a width of ≈ 150 MeV . The values fit very favorably to the most recent phase shift results as well as to the observations at BES. In the near-threshold two-pion production pp → pp π 0 π 0 , where the Roper excitation and its subsequent decays via the routes N * → Δπ → N ππ and N * → N σ are the only dominant processes, we find its direct decay into the N σ channel to be the by far dominating decay process --in favor of a monopole excitation of the Roper resonance.
