Determination of m(s) from strange tau decays

Results of the recent comprehensive ALEPH measurement of τ decays involving kaons, yielding the total strange width R τ , S and the strange spectral function, are used in a combination of strange and non-strange spectral moments to determine the strange quark mass and non-perturbative contributions to the strange hadronic width. Two methods with different theoretical uncertainties are employed, depending on whether or not the longitudinal spin zero hadronic component is included, yielding an average of m s ( M τ 2 ) = (163 −43 +34 ) MeV/ c 2 , where the errors account for experimental, theoretical and fitting uncertainties. The evolution down to 1 GeV gives m s (1 GeV 2 ) = (217 −57 +45 ) MeV/ c 2 . As a cross check, the running of the observables employed down to masses smaller than the τ mass is compared to the theoretical expectation.

talk: Santander 1998/09/14
tau: semileptonic decay
tau: branching ratio
K: production
moment: spectral representation
quantum chromodynamics: perturbation theory
effect: nonperturbative
parametrization
operator product expansion
mass: strangeness

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