The pp -> d pi(+)pi(0) reaction – a case of Delta Delta excitation without ABC effect
2009 (English)In: International Journal of Modern Physics A, ISSN 0217-751X, E-ISSN 1793-656X, Vol. 24, no 2-3, 561-563 p.Article in journal (Refereed) Published
The ABC effect, a low-mass enhancement in the invariant ππ mass, is observed in double-pionic fusion reactions leading to a bound nuclear system in the final state. From previous measurements there have been indications that this phenomenon is resctricted to the σ channel of the ππ system. With exclusive measurements of the pp → dπ<sup>+</sup>π<sup>0</sup> reaction at T<sub>p</sub> = 1.1 GeV we demonstrate that, indeed, the ABC effect does not occur in the vector-isovector ππ channel (ρ channel) despite the fact that the ΔΔ excitation is oberved to be the dominant reaction process. We also show that this reaction is well described by a t-channel ΔΔ excitation with the subsequent decay into the vector-isovector ππ channel given by the ρ channel operator
Place, publisher, year, edition, pages
2009. Vol. 24, no 2-3, 561-563 p.
ΔΔ, ΔΔ excitation, ρ channel, ρ? channel, ABC effect, excitation.
Research subject Nuclear Physics
IdentifiersURN: urn:nbn:se:su:diva-32647ISI: 000263880300064OAI: oai:DiVA.org:su-32647DiVA: diva2:281223
Totalt 42 författare2009-12-152009-12-152011-09-12Bibliographically approved