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Determination of |V_us| from hadronic tau decays

AuthorsGámiz, Elvira; Jamin, Matthias; Pich, Antonio ; Prades, Joaquim ; Schwab, Félix
Issue Date13-May-2005
AbstractThe 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 |V_us| as well as m_s. Our result, |V_us|=0.2208\pm0.0034, is competitive to the standard extraction of |V_us| from K_e3 decays and to the new proposals to determine it. Furthermore, the error associated to our determination of |V_us| 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 |V_us| and m_s to a set of moments of the hadronic tau decays invariant mass distribution, which will provide even a more accurate determination of both parameters.
Description6 páginas, 1 tabla.-- Trabajo presentado en la XXXX Rencontres de Moriond on Electroweak Interactions and Unified Theories celebrada del 5 al 12 de Marzo de 2005 en La Thuile (Italia).
Publisher version (URL)http://arxiv.org/abs/hep-ph/0505122
Appears in Collections:(IFIC) Artículos
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