Isotensor Dibaryon in the pp →ppπ+π- Reaction?

Authors :: Adlarson, P.
Augustyniak, W.
Bardan, W.
Bashkanov, M.
Bergmann, F. S.
Berłowski, M.
Bondar, A.
Büscher, M.
Calén, H.
Ciepał, I.
Clement, H.
Czerwiński, E.
Demmich, K.
Engels, R.
Erven, A.
Erven, W.
Eyrich, W.
Fedorets, P.
Föhl, K.
Fransson, K.
Goldenbaum, F.
Goswami, A.
Grigoryev, K.
Heijkenskjöld, L.
Hejny, V.
Hüsken, N.
Jarczyk, L.
Johansson, T.
Kamys, B.
Kemmerling, G.
Khoukaz, A.
Khreptak, O.
Kirillov, D. A.
Kistryn, S.
Kleines, H.
Kłos, B.
Krzemień, W.
Kulessa, P.
Kupść, A.
Lalwani, K.
Lersch, D.
Lorentz, B.
Magiera, A.
Maier, R.
Marciniewski, P.
Mariański, B.
Morsch, H. P.
Moskal, P.
Ohm, H.
Parol, W.
Publication Year :: 2018
Abstract: Exclusive measurements of the quasifree pp→ppπ+π- reaction have been carried out at WASA@COSY by means of pd collisions at Tp=1.2 GeV. Total and differential cross sections have been extracted covering the energy region Tp=1.08-1.36 GeV, which is the region of N∗(1440) and Δ(1232)Δ(1232) resonance excitations. Calculations describing these excitations by t-channel meson exchange are at variance with the measured differential cross sections and underpredict substantially the experimental total cross section. An isotensor ΔN dibaryon resonance with I(JP)=2(1+) produced associatedly with a pion is able to overcome these deficiencies.

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