We report on the observation of exclusive decays of B mesons to modes containing a D or D*+ and one or two charged pions. From kinematic reconstruction we determine the masses of the neutral and charged B mesons to be 5280.6±{}0.8±{}2.0 and 5278.6±{}0.8±{}2.0 MeV, respectively. The mass difference is 2.0±{}1.1±{}0.3 MeV. Branching ratios for these modes are given. From the charged-particle momentum spectrum in {Υ}(4S) decay, we find the average branching fraction for B-meson decay into a D or D* plus a charged pion to be (0.81±{}0.16)%. We find no signal for exclusive decays which would arise from the b{→}u transition and set upper limits for several such modes.
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Bebek et al. (1987) studied this question.
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