Abstract
For several years, experimental results for BR(b → lX) obtained near the Υ(4S) and Z0 resonances have disagreed at the few sigma level. A new OPAL result for BR(b → μX) based on the full data sample collected near the Z0 resonance is presented here. The result is extracted using muon momentum and jet shape information in b-tagged events. The inclusive charm hadron semileptonic branching ratio is measured in a charm enriched sample of hadronic Z0 decays. New analysis methods used by OPAL to extract (b → μ) and (c → l) are discussed in more detail, and the OPAL results are compared to those from other experiments. Both results are preliminary.
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