Symmetry breaking and the decays ψ′ → J ψπ0(η) and J ψ → η(η′) γ

Paul Langacker

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37 Scopus citations


The theoretical mechanisms for the decays ψ′ → ψπ0 and ψ′ → ψη, which violate SU2 and SU3, respectively discussed. It is argued that symmetry breaking in the decay amplitudes may be as important as π0 -η -η′ mixing. The π0 -η mechanism ψ′ → ψν → ψπ0 leads to Γ(ψ′ → ψπ0) = (3.3±1.0) × 10-3 Γ(ψ′ → ψν), but this number may be enhanced by a factor as large as 12 by π0-η′ mixing and isospin violation in the decay amplitude. The related decays ψ → ηγ and ψ → η′γ are also discussed.

Original languageEnglish (US)
Pages (from-to)447-450
Number of pages4
JournalPhysics Letters B
Issue number4
StatePublished - Mar 10 1980

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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