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We have used data from the OPAL detector at LEP to reconstruct D * mesons and secondary vertices in jets. We have studied the hemispheres of the events opposite these jets and obtain values of the hemisphere charged particle multiplicity in Z 0 → uu, dd, ss, Z 0 → cc and Z 0 → bb events ofn uds = 10.41 ± 0.06 ± 0.09 ± 0.19; n c = 10.76 ± 0...
This letter presents an updated measurement of the lifetime of the B 0s meson using 3.6 million hadronic Z 0 decays recorded by the OPAL detector at LEP from 1990 to 1994. A sample of B 0s decays is obtained using D -s+ combinations, where the D -s is reconstructed in either the φπ - or K *0 K - decay mode...
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