Exclusive measurements of pp -> d pi(+)pi(0): Double-pionic fusion without ABC effect

F. Kren, M. Bashkanov, D. Bogoslawsky, H. Calen, H. Clement*, L. Demiroers, C. Ekstrom, K. Fransson, J. Greiff, L. Gustafsson, B. Hoistad, G. Ivanov, M. Jacewicz, E. Jiganov, T. Johansson, O. Khakimova, S. Keleta, I. Koch, S. Kullander, A. KupscP. Marciniewski, R. Meier, B. Morosov, C. Pauly, H. Petren, Y. Petukhov, A. Povtorejko, R. J. M. Y. Ruber, K. Schonning, W. Scobel, T. Skorodko, B. Shwartz, J. Stepaniak, P. Thorngren-Engblom, V. Tikhomirov, G. J. Wagner, M. Wolke, A. Yamamoto, J. Zabierowski, J. Zlomanczuk

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Exclusive measurements of the reaction pp -> d pi(+)pi(0) have been carried out at T-p = 1.1 GeV at the CELSIUS storage ring using the WASA detector. The isovector pi(+)pi(0) channel exhibits no enhancement at low invariant pi pi masses, i.e. no ABC effect. Therefore this most basic isovector double-pionic fusion reaction qualifies as an ideal test case for the conventional t-channel Delta Delta excitation process. Indeed, the obtained differential distributions reveal the conventional t-channel Delta Delta mechanism as the appropriate reaction process, which also accounts for the observed energy dependence of the total cross section. (C) 2010 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)110-113
Number of pages4
JournalPhysics Letters B
Issue number2-3
Publication statusPublished - 8 Feb 2010




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