Measurement of the Radiative K e 3 Branching Ratio NA 48

Abstract

We present a measurement of the relative branching ratio of the decay K → πeνγ (Ke3γ) with respect to K → πeν (γ) (Ke3 + Ke3γ) decay. The result is based on observation of 19 000 Ke3γ and 5.6 · 10 Ke3 decays. The value of the branching ratio is Br(K e3γ , E γ > 30 MeV, θ eγ > 20o)/Br(K0e3) = (0.964 ± 0.008 −0.009)%. This result agrees with theoretical… (More)

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