Published July 30, 2010
| Published
Journal Article
Open
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
Abstract
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.
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.Attached Files
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Additional details
- Eprint ID
- 19497
- Resolver ID
- CaltechAUTHORS:20100818-103936294
- Department of Energy
- NSF
- NSERC (Natural Sciences and Engineering Research Council of Canada)
- CEA (Commissariat à l'Energie Atomique), France
- CNRS-IN2P3 (Centre National de la Recherche Scientifique), France
- BMBF (Bundesministerium für Bildung und Forschung), Germany
- DFG (Deutsche Forschungsgemeinschaft), Germany
- INFN (Istituto Nazionale di Fisica Nucleare), Italy
- FOM (Fundamenteel Onderzoek der Materie), The Netherlands
- NFR (Forskningsrådets), Norway
- Ministry of Education and Science of the Russian Federation (MES)
- Ministerio de Ciencia e Innovación (MEC), Spain
- Science and Technology Facilities Council (STFC), UK
- Marie Curie EIF (European Union)
- A. P. Sloan Foundation
- Created
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2010-08-26Created from EPrint's datestamp field
- Updated
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2021-11-08Created from EPrint's last_modified field