Gluonium content in η and η′ mesons from J/ψ decays

A wide set of recent data on J/Ψ decays is analysed in terms of a rather general phenomenological model in an attempt to uncover gluonium gg contaminations in the η and/or η′ mesons. The data include the (gluon rich)J/Ψ decays into pseudoscalar (P) and vector (V) mesons, J/Ψ→PP and PV, as well as J/Ψ→ηγ and η′γ. The model incorporates SU(3)-breaking effects, electromagnetic and strong contributions, and corrections to the latter ones. A reasonable description is achieved in terms of pure q {Mathematical expression} η and η′ mesons. Gluonium contaminations do not seem to be present or, at least, are not required. © 1986 Springer-Verlag.