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Extraction of m_s and |V_us| from Hadronic Tau Decays

Elvira Gamiz·Matthias Jamin·Antonio Pich·Joaquim Prades·Felix Schwab
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Abstract

We review recent work to determine the strange quark mass m_s as well as the proposal to determine |V_{us}| using hadronic tau decay data. The recent update of the strange spectral function by OPAL and their moments of the invariant mass distribution are employed. Our results are |V_us|=0.2208 +- 0.0034 and m_s (2 GeV)=81 +- 22 MeV. Our result is already competitive to the standard extraction of |V_us| from K_e3 decays and to the new proposals to determine it. The error on V_us is dominated by experiment and will be eventually much improved by the B-factories hadronic tau data. Ultimately, a simultaneous fit of both m_s and |V_us| to a set of moments of the hadronic tau decays invariant mass distribution will provide one of the most accurate determinations of these Standard Model parameters.

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Elvira Gamiz, Matthias Jamin, Antonio Pich, Joaquim Prades, Felix Schwab. 2004-11-20. Extraction of m_s and |V_us| from Hadronic Tau Decays. https://doi.org/10.1016/j.nuclphysbps.2005.02.008

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