Lifetimes of Charmed Particles Produced in a 20-{GeV} $\gamma p$ Experiment

  title={Lifetimes of Charmed Particles Produced in a 20-\{GeV\} \$\gamma p\$ Experiment},
  author={K. Abe and R. K. Yamamoto and T. Handler and Lloyd Ray Fortney and Austin Napier and James E. Brau and Ryuhei Sugahara and Caroline Milst{\`e}ne and K. C. Moffeit and Aharon Levy and John M. Butler and T. Maruyama and Irwin A. Pless and Yuying Wu and Richard H. Milburn and C. Victor Cautis and Elizabeth S. Hafen and Toshiki Sato and H. O. Cohn and Mildred Widgoff and Shinji Yamashita and Keizo Hasegawa and G. Hall and Shlomo Dado and N. Fujiwara and Joseph E. Lannutti and M. Jobes and William A. Mann and M. S. Rabin and Jacob Schneps and J. T. Shank and Y. Yoshimura and S. Tanaka and Peter J. Rankin and T. H. Fieguth and Kelsey Dp and George Yost and H. Rudnicka and Charles D. Woods and Borek Franěk and Wright Cameron and Robert Mer{\'e}nyi and W. J. Robertson and L. Berny and M. Macdermott and Colin Wilkins and Takashi Kitagaki and H. J. Hagris and Rob A. Gearhart and William Douglas Walker and K. Takahashi and George Thomas Condo and J. T. Carroll and H. Yuta and G. Yekutieli and S. Noguchi and Da Qing Huang and S. Wolbers and Harry H Bingham and Ken-ichiro Tamai and Kalmus Ge and A. Yamaguchi and A. M. Shapiro and Edwin R. Hancock and Pierre Lucas and Pl Lang and T. Hayashino and Joseph J. Murray and H. B. Wald and J. S. Chima and Alfred Goshaw and Robert I. Hulsizer and R. Erickson and Peter J. Dornan and J. Kent and Akira Suzuki and Charles K. Sinclair and Vasken Hagopian and Goldberg Jj and D. C. Colley and Gian P Gopal and A. H. Rogers and P. Haridas and Joseph Ballam and W. M. Bugg and Fumie Ochiai and A. P. T. Palounek and R. N. Diamond and S. Isaacson and Antonia Bevan and Evelyn L. Hart and S. Tether and D. Brick and S. W. O’Neale and Rodger C. Field and E. E. Ronat and T. C. Bacon},
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/sup +4.5//sub -2.5/ x 10/sup -13/ and 6.7/sup +3.5//sub -2.0/ x 10/sup -13/ sec, respectively, with a ratio of 1.2/sup +0.9//sub -0.5/.