OBSERVATION OF AN EVENT OF PAIR PHOTOPRODUCTION OF CHARMED anti-D0 D0 MESONS

An interesting event has been observed in an experiment on the production of charmed particles by tagged photons from CERN super synchrotron. The event was detected simultaneously in a nuclear emulsion and by the Omega Prime magnetic spectrometer. It is interpreted as the first observed case of the photoproduction of a pair of charmed neutral mesons D0-D0bar.\nA decay time t(D0bar) = (0.14+/-0.01) x 10^(-13) s has been found for the decay of the D0bar into a K+ pi- pi- pi+, while two solutions have been found for the decay of of a D0 into K0bar pi- e+ nu: t1(D0) = (3.4+/-0.3) x 10^(-13) s and t2(D0) = (7.5+/-0.3) x 10^(-13) s