Abstract
Seventy-one events containing charmed-particle decays have been observed in an experiment using the SLAC Hybrid Facility exposed to a backward-scattered photon beam. Several improvements were made to the apparatus since the previous experiment on charm photoproduction. Results for the charmed-meson lifetimes are consistent with the published results from the previous experiment and the two data samples have been combined yielding a total sample of 136 charm events. After imposing rigorous cuts, 50 neutral, 48 charged, and 2 charged/neutral ambiguous decays remain. From these, the charmed-meson lifetimes are measured to be tau/sub D/ = (8.6 +- 1.3/sub -0.3/ /sup .7/) x 10 T sec, tau/sub D/ = (6.1 +- 0.9 +- 0.3) x 10 T sec, and their ratio tau/sub D/ /tau0 = 1.4 +- 0.3/sub -/ /sub 0.1//sup +0.2/. The total charm cross section at a photon energy of 20 GeV has been measured to be (62 +- 8/sub -/10 V) nb. There is evidence for both DD-barX and D-bar /sub c/ X production with sigma/sub D/ /sub c/ X/sigma/sub charm/ = (71 +- 11 +- 6)%.
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