Measurement of the B-0 lifetime and oscillation frequency using (B)over-bar(0)-> D*+l-(nu)over-bar decays

The lifetime and oscillation frequency of the B-0 meson has been measured using (B) over bar (0) --> D(*+)l(-) )over bar> decays recorded on the Z(0) peak with the OPAL detector at LEP. The D*+ --> D(0)pi (+) decays were reconstructed using an inclusive technique and the production flavour of the B-0 mesons was determined using a combination of tags from the rest of the event. The resultstau (B0) = 1.541 +/- 0.028 +/- 0.023 ps,Deltam(d) = 0.497 +/- 0.024 +/- 0.025 ps(-1)were obtained, where in each case the first error is statistical and the second is systematic. (C) 2000 Elsevier Science B.V. All rights reserved.