A theory of the J/gY→η(η′)γ decays

V. A. Novikov, Mikhail "Misha" Shifman, Arkady Vainshtein, V. I. Zakharov

Research output: Contribution to journalArticlepeer-review

161 Scopus citations

Abstract

It is argued that the J gY→η(η′)γ decay rates are directly calculable within quantum chromodynamics. The calculation of Γ( J Ψ→ηγ) is most straightforward and involves no new hypotheses as compared to, say, the J Ψ→e+e- decay in detail earlier. To the contrary, evaluation of the J Ψ→η′γ width puts on trial dynamical results concerning the η′ coupling to gluons. The latter depends crucially on non-perturbative power terms in the QCD sum rules. The calculated numbers for Γ( J Ψ→ηγ) and Γ( J Ψ→η′γ) agree well with the data.

Original languageEnglish (US)
Pages (from-to)55-66
Number of pages12
JournalNuclear Physics, Section B
Volume165
Issue number1
DOIs
StatePublished - Mar 17 1980

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