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What is the nature of the ABC effect?

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Publication details

JournalInternational Journal of Modern Physics A
DatePublished - 10 Feb 2011
Issue number3-4
Number of pages3
Pages (from-to)627-629
Original languageEnglish


The ABC effect - an intriguing low-mass enhancement in the ππ invariant mass spectrum - is known from inclusive measurements of two-pion production in nuclear fusion reactions. Exclusive measurements have been carried out at CELSIUS/WASA and WASA-at-COSY for the fusion reactions leading to d, 3He and 4He. They all reveal this effect to be of isoscalar nature and associated with a narrow Lorentzian-shaped structure in the total cross section. The latter could point to the formation of an isoscalar resonance, which couples to the pn channel as well as to an intermediate ΔΔ state.

    Research areas

  • ΔΔ excitation, ABC effect, pn channel

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