We have measured the inclusive branching ratio for B→ψX to be (1.09±0.16±0.21)%, and the exclusive branching ratios for $B^{\mathrm{-}}$→ψ$K^{\mathrm{-}}$ and B¯ ${}_{}{}^0{}_{}{}^{}¯$ ${}_{}{}^{\mathrm{*}0}{}_{}{}^{}$ 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→ψX with $M_X$>1.5 GeV, and B→ψ’X.

• Received 2 September 1986

DOI:https://doi.org/10.1103/PhysRevD.34.3279