Quark Triangle Diagrams and Radiative Meson Decays

The radiative meson decays V → Pγ and P → γγ are analysed using the quark triangle diagram. Experimental data yield well determined estimates of the universal quark-antiquark-meson couplings gvqq -1 and 9pqq -1 for the light meson sector. Also predictions for the ratios of neutral to charged heavy meson decay coupling constants are given and await experimental confirmation.