Measurement of the $pn \to ppπ^0π^-$ Reaction in Search for the Recently Observed Resonance Structure in $dπ^0π^0$ and $dπ^+π^-$ systems
Creators: name: Adlarson, P.
name: Augustyniak, W.
name: Bardan, W.
name: Bashkanov, M.
name: Bergmann, F. S.
name: Berłowski, M.
name: Bhatt, H.
name: Büscher, M.
name: Calén, H.
name: Ciepał, I.
name: Clement, H.
name: Coderre, D.
name: Czerwiński, E.
name: Demmich, K.
name: Doroshkevich, E.
name: Engels, R.
name: Erven, W.
name: Eyrich, W.
name: Fedorets, P.
name: Föhl, K.
name: Fransson, K.
name: Goldenbaum, F.
name: Goslawski, P.
name: Goswami, A.
name: Grigoryev, K.
name: Gullström, C. --O.
name: Hauenstein, F.
name: Heijkenskjöld, L.
name: Hejny, V.
name: Hinterberger, F.
name: Hodana, M.
name: Höistad, B.
name: Jany, A.
name: Jany, B. R.
name: Jarczyk, L.
name: Johansson, T.
name: Kamys, B.
name: Kemmerling, G.
name: Khan, F. A.
name: Khoukaz, A.
name: Kirillov, D. A.
name: Kistryn, S.
name: Klaja, J.
name: Kleines, H.
name: Kłos, B.
name: Krapp, M.
name: Krzemień, W.
name: Kulessa, P.
name: Kupść, A.
name: Lalwani, K.
name: Lersch, D.
name: Li, L.
name: Lorentz, B.
name: Magiera, A.
name: Maier, R.
name: Marciniewski, P.
name: Mariański, B.
name: Mikirtychiants, M.
name: Morsch, H. --P.
name: Moskal, P.
name: Nandi, B. K.
name: Ohm, H.
name: Ozerianska, I.
name: del Rio, E. Perez
name: Piskunov, N. M.
name: Pluciński, P.
name: Podkopał, P.
name: Prasuhn, D.
name: Pricking, A.
name: Pszczel, D.
name: Pysz, K.
name: Pyszniak, A.
name: Redmer, C. F.
name: Ritman, J.
name: Roy, A.
name: Rudy, Z.
name: Sawant, S.
name: Schmidt, A.
name: Schadmand, S.
name: Sefzick, T.
name: Serdyuk, V.
name: Shah, N.
name: Siemaszko, M.
name: Siudak, R.
name: Skorodko, T.
name: Skurzok, M.
name: Smyrski, J.
name: Sopov, V.
name: Stassen, R.
name: Stepaniak, J.
name: Stephan, E.
name: Sterzenbach, G.
name: Stockhorst, H.
name: Ströher, H.
name: Szczurek, A.
name: Tolba, T.
name: Trzciński, A.
name: Varma, R.
name: Wagner, G. J.
name: Węglorz, W.
name: Wolke, M.
name: Wrońska, A.
name: Wüstner, P.
name: Wurm, P.
name: Yamamoto, A.
name: Yuan, X.
name: Zabierowski, J.
name: Zheng, C.
name: Zieliński, M. J.
name: Zipper, W.
name: Złomańczuk, J.
name: Żuprański, P.
name: Żurek, M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: Exclusive measurements of the quasi-free $pn \to ppπ^0π^-$ reaction have been performed by means of $pd$ collisions at $T_p$ = 1.2 GeV using the WASA detector setup at COSY. Total and differential cross sections have been obtained covering the energy region $\sqrt s$ = (2.35 - 2.46) GeV, which includes the region of the ABC effect and its associated resonance structure. No ABC effect, {\it i.e.} low-mass enhancement is found in the $π^0π^-$-invariant mass spectrum -- in agreement with the constraint from Bose statistics that the isovector pion pair can not be in relative s-wave. At the upper end of the covered energy region $t$-channel processes for Roper, $Δ(1600)$ and $ΔΔ$ excitations provide a reasonable description of the data, but at low energies the measured cross sections are much larger than predicted by such processes. Adding a resonance amplitude for the resonance at $m$=~2.37 GeV with $Γ$ =~70 MeV and $I(J^P)=~0(3^+)$ observed recently in $pn \to dπ^0π^0$ and $pn \to dπ^+π^-$ reactions leads to an agreement with the data also at low energies.