Abashian-Booth-Crowe effect in basic double-pionic fusion: a new resonance?

We report on an exclusive and kinematically complete high-statistics measurement of the basic double-pionic fusion reaction pn→dπ(0)π(0) over the full energy region of the ABC effect, a pronounced low-mass enhancement in the ππ-invariant mass spectrum. The measurements, which cover also the transiti...

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Veröffentlicht in:Physical review letters 2011-06, Vol.106 (24), p.242302-242302, Article 242302
Hauptverfasser: Adlarson, P, Adolph, C, Augustyniak, W, Baru, V, Bashkanov, M, Bednarski, T, Bergmann, F S, Berłowski, M, Bhatt, H, Brinkmann, K-T, Büscher, M, Calén, H, Clement, H, Coderre, D, Czerwiński, E, Doroshkevich, E, Ekström, C, Engels, R, Erven, W, Eyrich, W, Fedorets, P, Föhl, K, Fransson, K, Goldenbaum, F, Goslawski, P, Grigoryev, K, Grishina, V, Gullström, C-O, Hampe, J, Hanhart, C, Heijkenskjöld, L, Hejny, V, Hinterberger, F, Hodana, M, Höistad, B, Jacewicz, M, Janusz, M, Jany, A, Jany, B R, Jarczyk, L, Johansson, T, Kamys, B, Kemmerling, G, Khakimova, O, Khoukaz, A, Kistryn, S, Klaja, J, Kleines, H, Kłos, B, Kren, F, Krzemień, W, Kulessa, P, Kullander, S, Kupść, A, Lalwani, K, Lorentz, B, Magiera, A, Maier, R, Marciniewski, P, Mariański, B, Mikirtychiants, M, Moskal, P, Morsch, H-P, Nandi, B K, Niedźwiecki, S, Ohm, H, Passfeld, A, Pauly, C, del Rio, E Perez, Petukhov, Y, Piskunov, N, Pluciński, P, Podkopał, P, Povtoreyko, A, Prasuhn, D, Pricking, A, Pysz, K, Rausmann, T, Redmer, C F, Ritman, J, Roy, A, Ruber, R J M Y, Rudy, Z, Sawant, S, Schadmand, S, Schmidt, A, Schroeder, W, Sefzick, T, Serdyuk, V, Shah, N, Siemaszko, M, Siudak, R, Skorodko, T, Skurzok, M, Smyrski, J, Sopov, V, Stassen, R, Stepaniak, J, Sterzenbach, G, Stockhorst, H
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Zusammenfassung:We report on an exclusive and kinematically complete high-statistics measurement of the basic double-pionic fusion reaction pn→dπ(0)π(0) over the full energy region of the ABC effect, a pronounced low-mass enhancement in the ππ-invariant mass spectrum. The measurements, which cover also the transition region to the conventional t-channel ΔΔ process, were performed with the upgraded WASA detector setup at COSY. The data reveal the Abashian-Booth-Crowe effect to be uniquely correlated with a Lorentzian energy dependence in the integral cross section. The observables are consistent with a narrow resonance with m=2.37  GeV, Γ≈70  MeV and I(J(P))=0(3(+)) in both pn and ΔΔ systems. Necessary further tests of the resonance interpretation are discussed.
ISSN:0031-9007
1079-7114
1079-7114
DOI:10.1103/physrevlett.106.242302