Jψ radiative decays into ππγ and KKγ

Abstract The radiative decays of J ψ into f/γ, f′γ, ππγ and KKγ have been measured using the double arm spectrometer DASP at DORIS. We find B (J/ φ → fγ )=(J/ φ → fγ )/(J/ φ →all)=(0.9±0.3)×10 −3 to (1.5±0.4)×10 −3 depending on the multi- pole mode of the J ψ decay and that B( J /φ→ f ′γ) B( J /γ→ f γ)⪕ 1 3 .