Abstract
We have measured the branching ratio for the radiative decay ω → ηγ with ω mesons produced in antiproton-proton annihilation at rest into π 0 ω and ηω. Taking into account ϱ - ω mixing we find a branching ratio B ( ω → ηγ ) = (6.6 ± 1.7) × 10 −4 , in accord with the constructive interference solution in other experiments. The upper-limit for the direct radiative decay ω → 3γ is 1.9 × 10 −4 at 95% confidence level.
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