η and η′ meson production in J/ψ radiative decays from lattice QCD

I will present a first principles calculation within quantum chromodynamics (QCD) of the radiative decays of the J/ψ into the light pseudoscalar mesons η and η′. Within a lattice computation we obtain the transition form-factors as a function of photon virtuality from the timelike region, accessible experimentally via the 'Dalitz' decay J/ψ→e+e−η(′), through to the real photon point corresponding to J/ψ→γη(′). Prospects for computing light meson resonances in radiative charmonium decays in future lattice QCD calculations will be discussed.