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

• Main Authors: Fisher, Peter H. (Contributor), Cowan, Ray Franklin (Contributor), Dujmic, Denis (Contributor), Henderson, Shawn Wesley (Contributor), Sciolla, Gabriella (Contributor), Spitznagel, M. (Contributor), Yamamoto, R. K. (Contributor), Zhao, M. (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor), Massachusetts Institute of Technology. Laboratory for Nuclear Science (Contributor)
• Format: Article
• Language: English
• Published: American Physical Society, 2011-01-19T21:03:55Z.
• Subjects: Article
• Online Access: Get fulltext

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.
United States. Dept. of Energy
National Science Foundation (U.S.)
Natural Sciences and Engineering Research Council of Canada
France. Commissariat à l'énergie atomique et aux énergies alternatives
Institut National de Physique Nucleaire et Physique des Particules/CNRS
Bundesministerium für Bildung und Forschung, Germany
Deutsche Forschungsgemeinschaft (DFG)
Istituto Nazionale di Fisica Nucleare of Italy
FOM of the Netherlands
Norges forskningsråd
Russian Ministry of Science and Technology
Spain. Ministerio de Educación y Ciencia
Science and Technology Facilities Council (Great Britain)