Abstract
The η - η ′ pseudoscalar mixing angle and the gluonium content of the η ′ meson are deduced from an updated phenomenological analysis of J / ψ decays into a vector and a pseudoscalar meson. In absence of gluonium, the value of the mixing angle in the quark-flavour basis is found to be ϕ P = ( 40.5 ± 2.4 ) ° . In presence of gluonium, the values for the mixing angle and the gluonic content of the η ′ wave function are ϕ P = ( 44.5 ± 4.3 ) ° and Z η ′ 2 = 0.28 ± 0.21 , respectively. Corrections due to non-ideal ω - ϕ mixing are shown to be negligible. The newly reported values of B ( J / ψ → ρ π ) by the BABAR and BES Collaborations are crucial to get a consistent description of data.
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