and the τ hadronic width
نویسندگان
چکیده
منابع مشابه
Small-Size Instanton Corrections to the τ Hadronic Width
We compute the effect of small-size instanton corrections to current-current correlators, for all combinations of axial, vector, and possibly flavour nondiagonal currents. We apply our result to the hadronic decays of the τ lepton, in order to assess the reliability of the determination of αS from the τ hadronic width. CERN-TH.6787/93 NYU-TH.92/11/03 January 1993 On leave of absence from INFN, ...
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The total τ hadronic width can be accurately calculated using analyticity and the operator product expansion. The theoretical analysis of this observable is updated to include all available perturbative and non-perturbative corrections. The experimental determination of αs(M 2 τ) and its actual uncertainties are discussed.
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The determination of αs from hadronic τ decays is revisited, with a special emphasis on the question of higher-order perturbative corrections and different possibilities of resumming the perturbative series with the renormalisation group: fixed-order (FOPT) vs. contour-improved perturbation theory (CIPT). The difference between these approaches has evolved into a systematic effect that does not...
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ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 2009
ISSN: 0920-5632
DOI: 10.1016/j.nuclphysbps.2009.03.012