We update the values of the η-η'mixing angle and of the η'gluonium content by fitting our
measurement R ϕ= BR (ϕ→ η'γ)/BR (ϕ→ ηγ) together with several vector meson radiative …

The composition of the η and η'mesons has long been a source of discussion and is of
current interest with new experimental results appearing. We investigate what can be learnt …

We have measured the radiative decays φ→ ηγ, φ→ η′ γ selecting π+ π− γγγ final state in
a sample of∼ 5× 107φ-mesons produced at the Frascati φ-factory DAΦNE. We obtain Γ …

A phenomenological analysis of radiative V→ Pγ and P→ Vγ decays is performed with the
purpose of determining the gluonic content of the η and η'wave functions. Our results show …

QCD sum-rules. At leading order in perturbative QCD, we obtain the results: B (φ→
ηγ)=(1.15±0.2) 10-2 and B (φ→ η/γ)=(1.18±0.4) 10-4, in very good agreement with existing …

In a high-resolution missing mass experiment the total width of the η′(958) meson has
been measured to be 0.28±0.10 MeV. Using the known γγ branching ratio the value Γ (η′→ …

We have determined (a) the η/η′ mixing angle and (b) the regions of the allowed admixture
of the glueball component with JPC= 0−+ in η and η′, based on transition form factors η→ …

The mixing of η− η′ or η− η′− G is of a great theoretical interest, because it concerns
many aspects of the underlying dynamics and hadronic structure of pseudoscalar mesons …

We discuss the effect of η-η′ mixing and of axial current anomalies on various decay
processes. We describe the 2γ decays of η and η′, the radiative decays of low-lying vector …

The decay ψ (2 S)→ η J/ψ is used to measure, for the first time, all prominent η-meson
branching fractions with the same experiment in the same dataset, thereby providing a …