Production rate and decay lifetime measurements of B(s)0 mesons at LEP using D(s) and phi mesons

The study of the properties of inclusive production ofD s mesonsand of events in which a ϕ and a muon are present in the same jet provides two independent measurements of the probability,f s w , for a heavy quark to hadronize into a strangeB orD meson. The data sample analysed corresponds to 243,000 hadronicZ0 decays. The combined value of these measurements isf s w =0.19±0.06±0.08. From the flight distance distributions ofDs and of (ϕ- lepton) secondary vertices, with the leptonemitted at high transverse momentum relative to the jet axis, two values are obtained for theB s 0 mesonlifetime. Combining these measurements with a previous result based on the study ofDs-μ events, theB s 0 mesonlifetime is measured to be: 0.96±0.37 ps.