- We present a measurement of the relative branching ratio of the decay K0 → π±e±νγ (Ke3γ) with respect to K0 → π±e±ν (Ke3 + K e3γ) decay. The result is based on observation of 19 000 K e3γ and 5.6 × 106 Ke3 decays. The value of the branching ratio is Br(Ke3γ0, E γ* > 30 MeV, θeγ* > 20°)/Br(Ke30) = (0.964±0.008 -0.009+0.011)%. This result agrees with theoretical predictions but is at variance with a recently published result. © 2004 Elsevier B.V. All rights reserved.
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Measurement of the radiative K-e3 branching ratio
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