QCD tests in τ decays with optimized perturbation expansion

The next-to-next-to-leading order perturbative QCD corrections to R τ and the higher moments of the invariant mass distribution in the hadronic tau decays are considered. The renormalization scheme dependence of these corrections is discussed. The optimized predictions are obtained, using the princi...

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Bibliographic Details
Published in:Nuclear physics. Section B, Proceedings supplement Proceedings supplement, 1997-05, Vol.55 (3), p.403-408
Main Author: Ra̧czka, P.A.
Format: Article
Language:English
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Summary:The next-to-next-to-leading order perturbative QCD corrections to R τ and the higher moments of the invariant mass distribution in the hadronic tau decays are considered. The renormalization scheme dependence of these corrections is discussed. The optimized predictions are obtained, using the principle of minimal sensitivity as a guide to select the preferred renormalization scheme. A simplified fit is performed, using R τ and R τ 12, to see how the use of the optimized expansion may affect the determination of the α s and the dimension six condensates from the experimental data.
ISSN:0920-5632
1873-3832
DOI:10.1016/S0920-5632(97)00236-3