Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
1999-03-16
Physics
High Energy Physics
High Energy Physics - Experiment
9 Pages, LaTeX, 4 figures. Proceedings contributed to DPF'99, UCLA, Parallel session talk 3.02
Scientific paper
A selection of recent heavy-flavor results from OPAL using the LEP1 data sample are presented. The average polarization of b baryons in hadronic Z^0 decay has been measured to be -0.56^{+0.20}_{-0.13} (stat.) +- 0.09(syst.) using semileptonic decays of Lambda_b baryons. A search has been conducted for the radially excited D*' and has produced a 95% CL upper limit on its production of f(Z^0 -> D*'+-(2629))xBr(D*'+- -> D*+- pi+ pi-) < 2.1x10^{-3}. Finally, the measurement of the product branching ratio $f(b -> Lambda_b)xBr(Lambda_b -> Lambda 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 -> Lambda_b)xBr(Lambda_b -> Lambda l X), has been used to compute an updated R_{Lambda l} = Br(Lambda_b -> Lambda l X)/Br(Lambda_b -> \Lambda X)= (8.0 +- 1.2 (stat.) +- 0.9 (syst.))%, consistent with the expected low semileptonic branching fraction of the Lambda_b inferred from its short lifetime compared to the other b hadrons.
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