Abstract
Results are reported from a study of the impact parameters of electrons in hadronic events produced at the PEP ${e}^{+}{e}^{\ensuremath{-}}$ storage ring. Electrons in hadronic events are produced by bottom and charm decay and their impact parameters show hadrons containing bottom quarks to have a lifetime of ${1.16}_{\ensuremath{-}0.34}^{+0.37}$(stat.) \ifmmode\pm\else\textpm\fi{}0.23 (syst.) psec. This result is used to constrain elements of the Kobayashi-Maskawa mixing matrix.
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