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A measurement of the product branching ratio f(b -> Lambda(b)) center dot BR(Lambda(b) -> Lambda X) in Z(0) decays

Abbiendi, G; Ackerstaff, K; Alexander, G; Allison, J; Altekamp, N; Anderson, KJ; Anderson, S; ... OPAL Collaboration, ; + view all (1999) A measurement of the product branching ratio f(b -> Lambda(b)) center dot BR(Lambda(b) -> Lambda X) in Z(0) decays. EUR PHYS J C , 9 (1) 1 - 9.

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Abstract

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

Type: Article
Title: A measurement of the product branching ratio f(b -> Lambda(b)) center dot BR(Lambda(b) -> Lambda X) in Z(0) decays
Keywords: OPAL JET CHAMBER, BARYON PRODUCTION, PARTICLE IDENTIFICATION, TAU-LIFETIME, DETECTOR, LEP, PHYSICS
UCL classification: UCL > School of BEAMS
UCL > School of BEAMS > Faculty of Maths and Physical Sciences
URI: http://discovery.ucl.ac.uk/id/eprint/1303383
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