Measurements of B→Ds+X decays

This paper describes new measurements from CLEO of the inclusive B→${\mathit{D}}_{\mathit{s}}^{+}$X branching fraction as well as the ${\mathit{B}}^{+}$→${\mathit{D}}_{\mathit{s}}^{\left(\mathrm{*}\right)+}$D${\mathrm{¯}}^{\left(\mathrm{*}\right)0\mathrm{}}$ and ${\mathit{B}}^0$→${\mathit{D}}_{\mathit{s}}^{\left(\mathrm{*}\right)+}$ ${\mathit{D}}^{\left(\mathrm{*}\right)\mathrm{-}}$ branching fractions. The inclusive branching fraction is B(B→${\mathit{D}}_{\mathit{s}}^{+}$X)=(12.11±0.39±0.88±1.38)% where the first error is statistical, the second is the systematic error, and the third is the error due to the uncertainty in the ${\mathit{D}}_{\mathit{s}}^{+}$→φ${\mathrm{\pi }}^{+}$ branching fraction. The branching fractions for the B→${\mathit{D}}_{\mathit{s}}^{\left(\mathrm{*}\right)+}$D${\mathrm{¯}}^{\left(\mathrm{*}\right)}$ modes are found to be between 0.9% and 2.4% and are significantly more precise than previous measurements. The sum of the B→${\mathit{D}}_{\mathit{s}}^{\left(\mathrm{*}\right)+}$D${\mathrm{¯}}^{\left(\mathrm{*}\right)}$ branching fractions is consistent with the results of fits to the inclusive ${\mathit{D}}_{\mathit{s}}^{+}$ momentum spectrum. Factorization is used to arrive at a value for ${\mathit{f}}_{{\mathit{D}}_{\mathit{s}}}$, the ${\mathit{D}}_{\mathit{s}}^{+}$ decay constant. © 1996 The American Physical Society.