Exclusive Measurements of pp -> dpi+pi0: 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. Kohansson, O. Khakimova, S. Keleta, I., Koch, S. Kullander, A. Kupsc, P. Marciniewski, R. Meier
TL;DR
This study presents exclusive measurements of the pp -> dpi+pi0 reaction at 1.1 GeV, showing no ABC effect and confirming the t-channel Delta-Delta process as the dominant mechanism.
Contribution
It provides the first exclusive measurement of this reaction at 1.1 GeV, demonstrating the absence of the ABC effect and supporting the conventional Delta-Delta excitation model.
Findings
No low-mass enhancement in pi+pi0 invariant mass
Differential distributions match t-channel Delta-Delta excitation
Total cross section energy dependence explained by Delta-Delta process
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.
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