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Inclusive semileptonic branching ratios of b hadrons produced in Z decays

ALEPH Collaboration, The and Heister, A. and Bouhova-Thacker, Evelina and Bowdery, Christopher and Finch, Alexander and Foster, Frank and Hughes, Gareth and Jones, Roger (2002) Inclusive semileptonic branching ratios of b hadrons produced in Z decays. European Physical Journal C: Particles and Fields, 22 (4). pp. 613-626. ISSN 1434-6044

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Abstract

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 b→Xℓν and cascade b→c→Xℓν 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→Xℓν)=0.1070±0.0010stat±0.0023syst±0.0026model,BR(b→c→Xℓν)=0.0818±0.0015stat±0.0022syst+0.0010−0.0014model.

Item Type: Article
Journal or Publication Title: European Physical Journal C: Particles and Fields
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 63926
Deposited By: ep_importer_pure
Deposited On: 03 May 2013 10:22
Refereed?: Yes
Published?: Published
Last Modified: 21 Sep 2017 05:34
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/63926

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