Semileptonic Branching Fraction of Charged and Neutral B Mesons

The CLEO collaboration

An examination of leptons in ${\rm Y}(4S)$ events tagged by reconstructed $B$ decays yields semileptonic branching fractions of $b_{-}=(10.1\pm 1.8\pm 1.4)\%$ for charged and $b_0=(10.9…