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Title: Inclusive semileptonic branching ratios of b hadrons produced in Z decays

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

Authors:
Publication Date:
Research Org.:
Univ. of California, Santa Cruz, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
Contributing Org.:
The ALEPH Collaboration
OSTI Identifier:
1511284
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
European Physical Journal. C, Particles and Fields
Additional Journal Information:
Journal Volume: 22; Journal Issue: 4; Journal ID: ISSN 1434-6044
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; transverse momentum; momentum spectrum; opposite hemisphere; hadronic event; transverse momentum spectrum

Citation Formats

Heister et al., A. Inclusive semileptonic branching ratios of b hadrons produced in Z decays. United States: N. p., 2001. Web. doi:10.1007/s100520100851.
Heister et al., A. Inclusive semileptonic branching ratios of b hadrons produced in Z decays. United States. doi:10.1007/s100520100851.
Heister et al., A. Fri . "Inclusive semileptonic branching ratios of b hadrons produced in Z decays". United States. doi:10.1007/s100520100851. https://www.osti.gov/servlets/purl/1511284.
@article{osti_1511284,
title = {Inclusive semileptonic branching ratios of b hadrons produced in Z decays},
author = {Heister et al., A.},
abstractNote = {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 -0.0014+0.0010model.},
doi = {10.1007/s100520100851},
journal = {European Physical Journal. C, Particles and Fields},
number = 4,
volume = 22,
place = {United States},
year = {2001},
month = {12}
}

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