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Phys. Rev. Lett. 94, 011803 (2005) [4 pages]

Vus and ms from Hadronic τ Decays

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Elvira Gámiz1, Matthias Jamin2, Antonio Pich3, Joaquim Prades4, and Felix Schwab2,5
1Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
2Physik Department, Technische Universität München, D-85748 Garching, Germany
3Departament de Física Teòrica, IFIC, Universitat de València – CSIC, Apt. Correus 22085, E-46071 València, Spain
4Centro Andaluz de Física de las Partículas Elementales (CAFPE) and Departamento de Física Teórica y del Cosmos, Universidad de Granada, Campus de Fuente Nueva, E-18002 Granada, Spain
5Max-Planck-Institut für Physik – Werner-Heisenberg-Institut, D-80805 München, Germany

Received 9 August 2004; published 13 January 2005

Recent experimental results on hadronic τ decays into strange particles by the OPAL Collaboration are employed to determine Vus and ms from moments of the invariant mass distribution. Our results are Vus=0.2208±0.0034 and ms(2  GeV)=81±22  MeV. The error on Vus is dominated by experiment and should be improvable in the future. Nevertheless, already now our result is competitive with the standard extraction of Vus from Ke3 decays, and it is compatible with unitarity.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.011803
DOI:
10.1103/PhysRevLett.94.011803
PACS:
12.15.Hh, 11.55.Hx, 12.38.Lg, 14.60.Fg
 
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