Observation of pairs of charmed particles produced by high-energy photons in nuclear emulsions coupled with a magnetic spectrometer
- M.I. Adamovich
- Y.A. Alexandrov
- J.M. Bolta
- L. Bravo
- A.M. Cartacci
- M.M. Chernyavski
- A. Conti
- G. Crosetti
- M.G. Dagliana
- M. Dameri
- G. Diambrini-Palazzi
- G. Di Caporiacco
- A. Forino
- R. Gessaroli
- E. Higon
- S.P. Kharlamov
- V.G. Larionova
- R. Llosa
- J. Lory
- A. Mattei
- C. Meton
- B. Monteleoni-Conforto
- G.I. Orlova
- B. Osculati
- G. Parrini
- N.G. Peresadko
- A. Quareni Vignudelli
- A. Ruiz
- K.M. Romanovskaya
- M. Sannino
- D. Schune
- G. Tomasini
- M.I. Tretyakova
- Tsai Chu
- G. Vanderhaeghe
- E. Villar
- B. Willot
- M. Atkinson
- T. Brodbeck
- G.R. Brookes
- P.J. Bussey
- M. Davenport
- J.-P. Dufey
- R.J. Ellison
- W. Galbraith
- K. Heinloth
- J.S. Hutton
- R.E. Hughes-Jones
- M. Ibbotson
- B.R. Kumar
- G.D. Lafferty
- J.B. Lane
- J.-C. Lassalle
- R. McClatchey
- D. Mercer
- J.V. Morris
- D. Newton
- G.N. Patrick
- C. Raine
- A. Schl\uf6sser
- K.M. Storr
- A.P. Waite
DOIAbstract
Preliminary results of an experiment using nuclear emulsions exposed to a tagged photon beam at the CERN SPS (experiment WA58) are presented. Six events showing pairs of charmed particles have been found. One of these has been interpreted as an associated production of \u39bc+ and View the MathML source0. The mean lifetime of the neutral D meson based on three events is \u3c40 = (0.58 120.2+0.8 7 10 1213 s,, whereas a statistical analysis of eight charged charmed particles, assumed to be D mesons, leads to an estimate of the mean lifetime of \u3c4\ub1 48 4.4 7 10 1213 s
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