Decays of L=1 mesons to γπ, γrho, and γγ

The importance is stressed of measuring the rate and angular distributions in f0→γrho→γπ+π-. Predictions are made for this process on the basis of the single-quark-transition hypothesis in terms of the recently measured radiative widths GAMMA(B→γπ), GAMMA(A+-/sub 1,2/→γπ+-). Additional predictions, based on vector dominance and measured rates for pion emission, permit the conclusions that GAMMA(B→γπ)=184 +- 30 keV, GAMMA(A+-1→γπ+-)=1--1.6 MeV, GAMMA(A+-2→γπ+-)=375 +- 50 keV, and GAMMA(f0→γrho)=1.35 +- 0.2 MeV. About 10% of this last partial width occurs in M2 and 90% in E1 radiation. The relative sign of the M2 and E1 amplitudes is predicted and one way is shown to measure their ratio. Another application of vector dominance leads to the prediction GAMMA(f0→γγ)=7.7 +- 2 keV, dominantly in the helicity-2 channel. An intrinsic limitation of vector dominance for heavy-quark systems is noted