Exclusive Measurements of pp ->dpi+pi0: Double-Pionic Fusion without ABC Effect
/ Authors
F. Kren, M. Bashkanov, D. Bogoslawsky, H. Cal´en, H. Clement, L. Demiroers, C. Ekstr¨om, K. Fransson, J. Greiff, L. Gustafsson
and 30 more authors
B. H¨oistad, G. Ivanov, M. Jacewicz, E. Jiganov, T. Johansson, O. Khakimova, S. Keleta, I. Koch, S. Kullander, A. Kup´s´c, P. Marciniewski, R. Meier, B. Morosov, C. Pauly, H. Petr´en, Y. Petukhov, A. Povtorejko, R. Ruber, K. Sch¨onning, W. Scobel, T. Skorodko, B. Shwartz, J. Stepaniak, P. Th¨orngren-Engblom, V. Tikhomirov, G. Wagner, M. Wolke, A. Yamamoto, J. Zabierowski, J. Zlomanczuk
/ Abstract
Exclusive measurements of the reaction pp ->dpi+pi0 have been carried out at T_p = 1.1 GeV at the CELSIUS storage ring using the WASA detector. The isovector pi+pi0 channel exhibits no enhancement at low invariant pipi masses, i. e. no ABC effect. The differential distributions are in agreement with the conventional t-channel Delta-Delta excitation process, which also accounts for the observed energy dependence of the total cross section. This is an update of a previously published version -- see important note at the end of the article.