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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


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.

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