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.
@article{arxiv.0910.0995,
title = {Exclusive Measurements of pp -> dpi+pi0: Double-Pionic Fusion without ABC Effect},
author = {F. Kren and M. Bashkanov and D. Bogoslawsky and H. Calen and H. Clement and L. Demiroers and C. Ekstrom and k. Fransson and J. Greiff and L. Gustafsson and B. Hoistad and G. Ivanov and M. Jacewicz and E. Jiganov and T. Kohansson and O. Khakimova and S. Keleta and I. Koch and S. Kullander and A. Kupsc and P. Marciniewski and R. Meier and B. Morosov and C. Pauly and H. Petren and Y. Petukhov and A. Povtoreijko and R. J. M. Y. Ruber and K. Schonning and W. Scobel and T. Skorodko and B. Shwartz and J. Stepaniak and P. Thorngren-Engblom and V. Tikhomirov and G. J. Wagner and M. Wolke and A. Yamamoto and J. Zabierowski and J. Zlomanczuk},
journal= {arXiv preprint arXiv:0910.0995},
year = {2011}
}