We have measured the inclusive branching ratio for B{→}{ψ}X to be (1.09±{}0.16±{}0.21)%, and the exclusive branching ratios for B^-{→}{ψ}K^- and B{} ⁰ *0 to be (0.09±{}0.05)% and (0.41±{}0.18)%, respectively. The mass difference between neutral and charged B mesons is 1.1±{}2.1 MeV, while the difference between the mass of {Υ}(4S) and twice the mean B-meson mass is 18.5±{}3.0 MeV. The {ψ} momentum distribution implies a substantial two-body decay (in agreement with direct measurements), but also some combination of B{→}{ψ}X with MX>1.5 GeV, and B{→}{ψ}'X.
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Alam et al. (1986) studied this question.
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