A Measurement of the Product Branching Ratio f(b->Lambdab).BR(Lambdab->Lambda X) in Z0 Decays
Abstract
The product branching ratio, f(b->Lambdab).BR(Lambdab->Lambda X), where Lambdab denotes any weakly-decaying b-baryon, has been measured using the OPAL detector at LEP. Lambdab are selected by the presence of energetic Lambda particles in bottom events tagged by the presence of displaced secondary vertices. A fit to the momenta of the Lambda particles separates signal from B meson and fragmentation backgrounds. The measured product branching ratio is f(b->Lambdab).BR(Lambdab->Lambda X) = (2.67+-0.38(stat)+0.67-0.60(sys))% Combined with a previous OPAL measurement, one obtains f(b->Lambdab).BR(Lambdab->Lambda X) = (3.50+-0.32(stat)+-0.35(sys))%.
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