Isospin decomposition of the basic double-pionic fusion in the region of the ABC effect

Exclusive and kinematically complete high-statistics measurements of the basic double-pionic fusion reactions pn→dπ0π0, pn→dπ+π− and pp→dπ+π0 have been carried out simultaneously over the energy region of the ABC effect using the WASA detector setup at COSY. Whereas the isoscalar reaction part given...

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Veröffentlicht in:	Physics letters. B 2013-04, Vol.721 (4-5), p.229-236
Hauptverfasser:	Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bednarski, T., Bergmann, F.S., Berłowski, M., Bhatt, H., Büscher, M., Calén, H., Clement, H., Coderre, D., Czerwiński, E., Demmich, K., Doroshkevich, E., Engels, R., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goslawski, P., Goswami, A., Grigoryev, K., Gullström, C.-O., Hauenstein, F., Heijkenskjöld, L., Hodana, M., Höistad, B., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khan, F.A., Khoukaz, A., Klaja, J., Kleines, H., Kłos, B., Krapp, M., Kulessa, P., Kupść, A., Lalwani, K., Lersch, D., Li, L., Lorentz, B., Magiera, A., Maier, R., Mariański, B., Mikirtychiants, M., Morsch, H.-P., Moskal, P., Nandi, B.K., Ohm, H., Ozerianska, I., Perez del Rio, E., Pluciński, P., Podkopał, P., Prasuhn, D., Pricking, A., Pszczel, D., Redmer, C.F., Ritman, J., Roy, A., Rudy, Z., Sawant, S., Schadmand, S., Schmidt, A., Sefzick, T., Serdyuk, V., Shah, N., Siemaszko, M., Siudak, R., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Ströher, H., Szczurek, A., Tolba, T., Trzciński, A., Varma, R., Vlasov, P., Wagner, G.J., Węglorz, W., Wolke, M., Wrońska, A., Wüstner, P., Wurm, P., Yamamoto, A., Yuan, X., Yurev, L., Zabierowski, J., Zieliński, M.J., Zipper, W., Żuprański, P., Żurek, M.
Format:	Artikel
Sprache:	eng
Schlagworte:	ABC effect and resonance structure Channels Charging Cross sections Double pion production Elementary particles Energy use Isospin decomposition lsospin decomposition Mass distribution Nuclear fusion Pions
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Beschreibung
Zusammenfassung:	Exclusive and kinematically complete high-statistics measurements of the basic double-pionic fusion reactions pn→dπ0π0, pn→dπ+π− and pp→dπ+π0 have been carried out simultaneously over the energy region of the ABC effect using the WASA detector setup at COSY. Whereas the isoscalar reaction part given by the dπ0π0 channel exhibits the ABC effect, i.e. a low-mass enhancement in the ππ-invariant mass distribution, as well as the associated resonance structure in the total cross section, the isovector part given by the dπ+π0 channel shows a smooth behavior consistent with the conventional t-channel ΔΔ process. The dπ+π− data are very well reproduced by combining the data for isovector and isoscalar contributions, if the kinematical consequences of the isospin violation due to different masses for charged and neutral pions are taken into account.
ISSN:	0370-2693 1873-2445 1873-2445
DOI:	10.1016/j.physletb.2013.03.019