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-flavor basis is found to be φ P =(40.7±2.3)°. In presence of gluonium, the values for the mixing angle and the gluonic content of the η ′ wave function are φ P =(44.6±4.4)° and \(Z^{2}_{\eta^{\prime}}=0.29^{+0.18}_{-0.26}\) , respectively. The newly reported values of B(J/ψ→ρ π) by the BABAR and BES Collaborations are crucial to get a consistent description of the data.
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