Determination of |Vus| from hadronic tau decays
E. Gamiz, M. Jamin, A. Pich, J. Prades, F. Schwab
Abstract
The recent update of the strange spectral function and the moments of the invariant mass distribution by the OPAL collaboration from hadronic tau decay data are employed to determine |Vus| as well as ms. Our result, |Vus|=0.22080.0034, is competitive to the standard extraction of |Vus| from Ke3 decays and to the new proposals to determine it. Furthermore, the error associated to our determination of |Vus| can be reduced in the future since it is dominated by the experimental uncertainty that will be eventually much improved by the B-factories hadronic tau data. Another improvement that can be performed is the simultaneous fit of both |Vus| and ms to a set of moments of the hadronic tau decays invariant mass distribution, which will provide even a more accurate determination of both parameters.
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