Extraction of ms and |Vus| from Hadronic Tau Decays
Abstract
We review recent work to determine the strange quark mass ms as well as the proposal to determine |Vus| 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 |Vus|=0.2208 +- 0.0034 and ms (2 GeV)=81 +- 22 MeV. Our result is already competitive to the standard extraction of |Vus| from Ke3 decays and to the new proposals to determine it. The error on Vus is dominated by experiment and will be eventually much improved by the B-factories hadronic tau data. Ultimately, a simultaneous fit of both ms and |Vus| 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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