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 The pp -> d pi(+)pi(0) reaction – a case of Delta Delta excitation without ABC effect
Stockholm University, Faculty of Science, Department of Physics. (kärnfysik)
Stockholm University, Faculty of Science, Department of Physics. (kärnfysik)
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
Abstract [en]

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.
Keyword [en]
ΔΔ, ΔΔ excitation, ρ channel, ρ? channel, ABC effect, excitation.
National Category
Subatomic Physics
Research subject
Nuclear Physics
Identifiers
URN: urn:nbn:se:su:diva-32647ISI: 000263880300064OAI: oai:DiVA.org:su-32647DiVA: diva2:281223
Note
Totalt 42 författareAvailable from: 2009-12-15 Created: 2009-12-15 Last updated: 2017-12-12Bibliographically approved

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