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Title: Measurement of the np->np [pi]0[pi]0 reaction in search for the recently observed d*(2380) resonance
Authors: Adlarson, P.
Augustyniak, W.
Bardan, W.
Bashkanov, M.
Bergmann, F. S.
Berłowski, M.
Bhatt, H.
Bondar, H.
Büscher, M.
Calen, H.
Ciepał, I.
Żuprański, P.
Żurek, M.
Clement, H.
Coderre, D.
Czerwiński, E.
Demmich, K.
Doroshkevich, E.
Engels, R.
Erven, A.
Ervenl, W.
Eyrich, W.
Fedorets, P.
Foh, K.
Fransson, K.
Goldenbaum, F.
Gosławski, P.
Goswami, A.
Grigoryev, K.
Gullstrom, C.-O.
Hauenstein, F.
Heijkenskjold, L.
Hejny, V.
Hoistad, B.
Husken, N.
Jarczyk, L.
Johansson, T.
Kamys, B.
Kemmerling, G.
Khan, F. A.
Khoukaz, A.
Kirillov, D. A.
Kistryn, S.
Kleines, H.
Kłos, Barbara
Krzemień, W.
Kulessa, P.
Kupść, A.
Kuzmin, A.
Lalwani, K.
Lersch, D.
Lorentz, B.
Magiera, A.
Maier, R.
Marciniewski, P.
Mariański, B.
Mikirtychiants, M.
Morsch, H.-P.
Moskal, P.
Ohm, H.
Ozerianska, I.
Perez del Rio, E.
Piskunov, N. M.
Podkopał, P.
Prasuhn, D.
Pricking, A.
Pszczel, D.
Pysz, K.
Pyszniak, A.
Ritman, J.
Roy, A.
Rudy, Z.
Sawant, S.
Schadmand, S.
Sefzick, T.
Serdyuk, V.
Shwartz, B.
Siudak, R.
Skorodko, T.
Skurzok, M.
Smyrski, J.
Sopov, V.
Stassen, R.
Stepaniak, J.
Stephan, Elżbieta
Sterzenbach, G.
Stockhorst, H.
Stroher, H.
Szczurek, A.
Taschner, A.
Trzciński, A.
Varma, R.
Wagner, G. J.
Wolke, M.
Wrońska, A.
Wustner, P.
Wurm, P.
Yamamoto, A.
Zabierowski, J.
Zieliński, M. J.
Zink, A.
Złomańczuk, J.
Keywords: two-pion production; ABC effect and resonance structure; dibaryon resonance
Issue Date: 2015
Citation: Physics Letters B, Vol. 743 (2015), s. 325-332
Abstract: Exclusive measurements of the quasi-free np→npπ 0 π 0 reaction have been performed by means of dp collisions at T d =2.27GeV using the WASA detector setup at COSY. Total and differential cross sections have been obtained covering the energy region s=(2.35-2.46)GeV, which includes the region of the ABC effect and its associated d ® (2380) resonance. Adding the d ® resonance amplitude to that for the conventional processes leads to a reasonable description of the data. The observed resonance effect in the total cross section is in agreement with the predictions of Fäldt and Wilkin as well with those of Albadajedo and Oset. The ABC effect, i.e. the low-mass enhancement in the π 0 π 0 -invariant mass spectrum, is found to be very modest - if present at all, which might pose a problem to some of its interpretations.
DOI: 10.1016/j.physletb.2015.02.067
ISSN: 0370-2693
Appears in Collections:Artykuły (WNŚiT)

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