Abstract
Abstract With the ARGUS detector at the e+ e− storage ring DORIS II, we have determined decay fraction and electron momentum spectrum of the inclusive decay mode B → ev X. Using lepton tags from the second B meson in 209000 Γ(4S)→B decays, we could determine the momentum spectrum for all momenta Pe > 0.6 GeV/c. Including the small extrapolation to Pe > 0, we find the model-independent decay fraction Br(B→evX) = (9.6 ± 0.5 ± 0.4)%. Adding D meson tags, our result is (9.7 ± 0.5 ± 0.4)%.
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