Lifetimes of Charmed Particles Produced in a 20-GeV<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>γ</mml:mi><mml:mi>p</mml:mi></mml:math>Experiment

Eleven neutral and nine charged decays of charmed particles have been observed in a sample of 205 000 hadronic interactions in a 1.2-million-picture exposure of the SLAC Hybrid Facility bubble chamber to a 20-GeV/c backward-scattered laser beam. The charged and neutral lifetimes were determined to be ${8.2}_{\ensuremath{-}2.5}^{+4.5}$\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}13}$ and ${6.7}_{\ensuremath{-}2.0}^{+3.5}$\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}13}$ sec, respectively, with a ratio of ${1.2}_{\ensuremath{-}0.5}^{0.9}$.