Neutral hadronic η’ andηdecays and electromagnetic mixing

We directly determine the electromagnetic mixing of η, η’, and ${\pi }^0$ mesons by analyzing the neutral decays η→3${\pi }^0$, η’→η2${\pi }^0$, and the recently measured η’→3${\pi }^0$. Our result for the mixing parameters 〈${\pi }^0$‖$H_{\mathrm{em}}$‖η〉≊-0.0059±0 .0006 ${\mathrm{GeV}}^2$ and 〈${\pi }^0$‖$H_{\mathrm{em}}$‖η’〉≊-0.0055± 0.0005 ${\mathrm{GeV}}^2$ is relatively insensitive to the semistrong mixing angle of the ηη’ system and reasonably consistent with tadpole predictions based on the quark model.