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. 2011 Jun 17;106(24):242302.
doi: 10.1103/PhysRevLett.106.242302. Epub 2011 Jun 17.

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

P Adlarson  1 , C Adolph, W Augustyniak, V Baru, M Bashkanov, T Bednarski, F S Bergmann, M Berłowski, H Bhatt, K-T Brinkmann, M Büscher, H Calén, H Clement, D Coderre, E Czerwiński, E Doroshkevich, C Ekström, R Engels, W Erven, W Eyrich, P Fedorets, K Föhl, K Fransson, F Goldenbaum, P Goslawski, K Grigoryev, V Grishina, C-O Gullström, J Hampe, C Hanhart, L Heijkenskjöld, V Hejny, F Hinterberger, M Hodana, B Höistad, M Jacewicz, M Janusz, A Jany, B R Jany, L Jarczyk, T Johansson, B Kamys, G Kemmerling, O Khakimova, A Khoukaz, S Kistryn, J Klaja, H Kleines, B Kłos, F Kren, W Krzemień, P Kulessa, S Kullander, A Kupść, K Lalwani, B Lorentz, A Magiera, R Maier, P Marciniewski, B Mariański, M Mikirtychiants, P Moskal, H-P Morsch, B K Nandi, S Niedźwiecki, H Ohm, A Passfeld, C Pauly, E Perez del Rio, Y Petukhov, N Piskunov, P Pluciński, P Podkopał, A Povtoreyko, D Prasuhn, A Pricking, K Pysz, T Rausmann, C F Redmer, J Ritman, A Roy, R J M Y Ruber, Z Rudy, S Sawant, S Schadmand, A Schmidt, W Schroeder, T Sefzick, V Serdyuk, N Shah, M Siemaszko, R Siudak, T Skorodko, M Skurzok, J Smyrski, V Sopov, R Stassen, J Stepaniak, G Sterzenbach, H Stockhorst, H Ströher, A Szczurek, A Täschner, T Tolba, A Trzciński, R Varma, P Vlasov, G J Wagner, W Węglorz, A Winnemöller, A Wirzba, M Wolke, A Wrońska, P Wüstner, P Wurm, X Yuan, L Yurev, J Zabierowski, C Zheng, M J Zieliński, W Zipper, J Złomańczuk, P Zuprański; WASA-at-COSY Collaboration
Affiliations

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

P Adlarson et al. Phys Rev Lett. .

Abstract

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.

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