Inclusive semileptonic branching ratios of b hadrons produced in Z decays

Details Inclusive semileptonic branching ratios of b hadrons produced in Z decays Inclusive semileptonic branching ratios of b hadrons produced in Z decays

2001-08-02

arxiv.org/abs/hep-ex/0108007v1

Eur.Phys.J.C22:613-626,2002

Physics

High Energy Physics

High Energy Physics - Experiment

24 pages, 7 figures

Scientific paper

10.1007/s100520100851

A measurement of the inclusive semileptonic branching ratios of b hadrons produced in Z decay is presented, using four million hadronic events collected by the ALEPH detector from 1991 to 1995. Electrons and muons are selected opposite to b-tagged hemispheres. Two different methods are explored to distinguish the contributions from direct $\bl$ and cascade $\bcl$ decays to the total lepton yield. One is based on the lepton transverse momentum spectrum, the other makes use of the correlation between the charge of the lepton and charge estimators built from tracks in the opposite hemisphere of the event. The latter method reduces the dependence on the modelling of semileptonic b decays. The results obtained by averaging the two techniques are BR(b->l) = 0.1070 +- 0.0010 +- 0.0023 +- 0.0026 BR(b->c->l) = 0.0818 +- 0.0015 +- 0.0022 + 0.0022 -0.0014

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