Measurement of charmed-particle lifetimes and decay branching ratios

The lifetimes of charmed hadrons photoproduced in nuclear emulsion have been computed from a practically background-free sample of 44 neutral particle decays and 42 charged-particle decays including 27 D±, 11Λc+, 1Ds+ and 3 ambiguous decays. The values obtained are τ(D0,antiD0)=(3.6-0.8+1.2±0.7)10-13s, τ(D±)=(5.0-1.0+1.5±1.9)10-13s, τ(Λc+)=(2.3-0.6+0.9±0.4)10-13s. Branching ratios of various decay topologies were also obtained