Measurement of the semileptonic branching ratio
charm hadrons produced in decays
The OPAL Collaboration
G.Abbiendi 2 - et al.
2Dipartimento di Fisica dell' Università di Bologna and INFN, I-40126 Bologna, Italy
Recveived: 17 September 1998 / Published online: 1 March 1999
The inclusive charm hadron semileptonic branching fractions and in events have been determined using 4.4 million hadronic decays collected with the OPAL detector at LEP. A charm-enriched sample is obtained by selecting events with reconstructed mesons. Using leptons found in the hemisphere opposite that of the mesons, the semileptonic branching fractions of charm hadrons are measured to be
where the first errors are in each case statistical and the second systematic. Combining these measurements, an inclusive semileptonic branching fraction of charm hadrons of