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Measurements of Charged Current Lepton Universality and |V[subscript us]| Using Tau Lepton Decays to e-ν[over-bar]eνtau, mu-ν[over-bar]muν, pi-νtau, and K-νtau

Author(s)
Dujmic, Denis; Henderson, Shawn Wesley; Sciolla, Gabriella; Yamamoto, R. K.; Zhao, M.; Fisher, Peter H; Cowan, Ray F; Spitznagel, Michael A; ... Show more Show less
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Alternative title
Measurements of Charged Current Lepton Universality and |Vus| Using Tau Lepton Decays to e-ν̅ eντ, μ-ν̅ μντ, π-ντ, and K-ντ
Terms of use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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Abstract
Using 467  fb-1 of e+e- annihilation data collected with the BABAR detector, we measure B(τ- -->mu-ν̅ muντ)/B(τ- -->e-ν̅ eντ)=(0.9796±0.0016±0.0036), B(τ- -->pi-ντ)/B(τ- -->e-ν̅ eντ)=(0.5945±0.0014±0.0061), and B(τ-→K-ντ)/B(τ- -->e-ν̅ eντ)=(0.03882±0.00032±0.00057), where the uncertainties are statistical and systematic, respectively. From these precision τ measurements, we test the standard model assumption of mu-e and τ-mu charge current lepton universality and provide determinations of |Vus| experimentally independent of the decay of a kaon.
Date issued
2010-07
URI
http://hdl.handle.net/1721.1/60673
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
BABAR Collaboration et al. “Measurements of Charged Current Lepton Universality and |V_{us}| Using Tau Lepton Decays to e^{-} nu [over -bar]_{e} nu _{ tau }, mu^{-} nu [over -bar]_{mu} nu _{ tau }, pi^{-} nu _{ tau }, and K^{-} nu _{ tau }.” Physical Review Letters 105.5 (2010): 051602. © 2010 The American Physical Society.
Version: Final published version
ISSN
0031-9007

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