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Double-pion production in nucleon collisions on few-body systems - The abc effect and its possible origin

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Publication details

JournalInternational Journal of Modern Physics A
DatePublished - 30 Jan 2009
Issue number2-3
Number of pages8
Pages (from-to)255-262
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@COSY for the fusion reactions leading to d, 3He and 4He. They all reveal this effect to be a σ channel phenomenon combined with a resonance-like behavior in the total cross section. The latter points to the formation of an isoscalar dibaryonic resonance, which couples to the pn channel as well as to a δδ intermediate state.

    Research areas

  • δδ excitation, σ channel, ABC effect, Dibaryon resonance, Pn channel

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