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Measurements of Charged Current Lepton Universality and |V_(us)| Using Tau Lepton Decays to e¯ν(overbar)_(e)ν_τ, μ¯ν(overbar)_(μ)ν_τ, π¯ν_τ, and K¯ν_τ

Aubert, B. and Doll, D. A. and Echenard, B. and Fang, F. and Hitlin, D. G. and Narsky, I. and Ongmongkolkul, P. and Piatenko, T. and Porter, F. C. (2010) Measurements of Charged Current Lepton Universality and |V_(us)| Using Tau Lepton Decays to e¯ν(overbar)_(e)ν_τ, μ¯ν(overbar)_(μ)ν_τ, π¯ν_τ, and K¯ν_τ. Physical Review Letters, 105 (5). 051602. ISSN 0031-9007.

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Using 467  fb^(-1) of e+e- annihilation data collected with the BABAR detector, we measure [B(τ¯→ μ¯ν(overbar)_(μ)ν_τ]/[B(τ¯→ e¯ν(overbar)_(e)ν_τ)] = (0.9796±0.0016±0.0036), [B(τ¯→π¯ν_τ)]/[B(τ¯→e¯ν(overbar)ν_τ)] = (0.5945±0.0014±0.0061), and [B(τ¯→K¯ν_τ)]/[B(τ¯→e¯ν(overbar)_(e)ν_τ)] = (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 μ-e and τ-μ charge current lepton universality and provide determinations of |V_(us)| experimentally independent of the decay of a kaon.

Item Type:Article
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URLURL TypeDescription
Hitlin, D. G.0000-0003-4028-6982
Porter, F. C.0000-0003-1948-8889
Additional Information:© 2010 American Physical Society. Received 2 December 2009; published 28 July 2010. We are grateful for the excellent luminosity and machine conditions provided by our PEP-II colleagues, and for the substantial dedicated effort from the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and kind hospitality. This work is supported by DOE and NSF (USA), NSERC (Canada), CEA and CNRS-IN2P3 (France), BMBF and DFG (Germany), INFN (Italy), FOM (The Netherlands), NFR (Norway), MES (Russia), MEC (Spain), and STFC (United Kingdom). Individuals have received support from the Marie Curie EIF (European Union) and the A. P. Sloan Foundation.
Funding AgencyGrant Number
Department of EnergyUNSPECIFIED
NSERC (Natural Sciences and Engineering Research Council of Canada)UNSPECIFIED
CEA (Commissariat à l'Energie Atomique), FranceUNSPECIFIED
CNRS-IN2P3 (Centre National de la Recherche Scientifique), FranceUNSPECIFIED
BMBF (Bundesministerium für Bildung und Forschung), GermanyUNSPECIFIED
DFG (Deutsche Forschungsgemeinschaft), GermanyUNSPECIFIED
INFN (Istituto Nazionale di Fisica Nucleare), ItalyUNSPECIFIED
FOM (Fundamenteel Onderzoek der Materie), The NetherlandsUNSPECIFIED
NFR (Forskningsrådets), NorwayUNSPECIFIED
Ministry of Education and Science of the Russian Federation (MES)UNSPECIFIED
Ministerio de Ciencia e Innovación (MEC), SpainUNSPECIFIED
Science and Technology Facilities Council (STFC), UKUNSPECIFIED
Marie Curie EIF (European Union)UNSPECIFIED
A. P. Sloan FoundationUNSPECIFIED
Issue or Number:5
Classification Code:PACS:11.30.Hv, 12.15.Hh, 13.35.Dx, 14.60.Fg
Record Number:CaltechAUTHORS:20100818-103936294
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:19497
Deposited By: Jason Perez
Deposited On:26 Aug 2010 22:32
Last Modified:09 Mar 2020 13:18

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