Measurement of the Radiative Ke3 Branching Ratio
Abstract
We present a measurement of the relative branching ratio of the decay KL -> pi e nu gamma (Ke3gamma) with respect to KL-> pi e nu (gamma) (Ke3+Ke3gamma) decay. The result is based on observation of 19 000 Ke3gamma and 5.6 x 106 Ke3 decays. The value of the branching ratio is Br(Ke3gamma, Egamma*>30 MeV,theta(e,gamma)*>20o)/Br(Ke3)= (0.964+-0.008+0.011-0.009)%. This result agrees with theoretical predictions but is at variance with a recently published result.
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