A 2+1 flavor lattice QCD calculation determines the J/psi to gamma eta and J/psi to gamma eta' transition form factors separately for the first time, finding rates below experiment.
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$\eta$ and $\eta'$ meson production in $J/\psi$ radiative decays from lattice QCD
A 2+1 flavor lattice QCD calculation determines the J/psi to gamma eta and J/psi to gamma eta' transition form factors separately for the first time, finding rates below experiment.