Recent Heavy-Flavor Measurements from OPAL

A selection of recent heavyavor results from OPAL using the LEP1 data sample are presented. The average polarization of b baryons in hadronic Z decay has been measured to be 0:56 0:13(stat:) 0:09(syst:) using semileptonic decays of b baryons. A search has been conducted for the radially excited D 0 and has produced a 95% CL upper limit on its production of f(Z ! D 0 (2629)) Br(D 0 ! D + ) < 2:1 10 . Finally, the measurement of the product branching ratio f(b ! b) Br( b ! X) = (2:67 0:38(stat) +0:67 0:60(syst:))% has been made. This measurement, along with an earlier measurement of the product branching ratio f(b! b) Br( b ! `X), has been used to compute an updated R ` = Br( b ! `X)=Br( b ! X) = (8:0 1:2(stat:) 0:9(syst:))%, consistent with the expected low semileptonic branching fraction of the b inferred from its short lifetime compared to the other b hadrons.