Abashian-Booth-Crowe Effect in Basic Double-Pionic Fusion: A New Resonance?
by: P. Adlarson, C. Adolph, W. Augustyniak, V. Baru, M. Bashkanov, T. Bednarski, F. S. Bergmann, M. Berlowski, 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. Klos, 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, Perez del Rio, Y. Petukhov, N. Piskunov, P. Pluciński, P. Podkopal, 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. Wkeglorz, 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. Zlomańczuk, P. Żuprański
Physical Review Letters, Vol. 106, No. 24. (Jun 2011), 242302, doi:10.1103/physrevlett.106.242302 Key: citeulike:9425728
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Abstract
We report on an exclusive and kinematically complete high-statistics measurement of the basic double-pionic fusion reaction pn→dπ0π0 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(JP)=0(3+) in both pn and ΔΔ systems. Necessary further tests of the resonance interpretation are discussed.
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