V_us and m_s from hadronic tau decays

Details V_us and m_s from hadronic tau decays V_us and m_s from hadronic tau decays

2004-08-03

arxiv.org/abs/hep-ph/0408044v1

Phys.Rev.Lett.94:011803,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 1 figure

Scientific paper

10.1103/PhysRevLett.94.011803

Recent experimental results on hadronic tau decays into strange particles by the OPAL collaboration are employed to determine V_us and m_s from moments of the invariant mass distribution. Our results are V_us = 0.2208+-0.0034 and m_s(2 GeV) = 81+-22 MeV. The error on V_us is dominated by experiment, and should be improvable in the future. Nevertheless, already now our result is competitive to the standard extraction of V_us from K_e3 decays, and it is compatible with unitarity.

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