QCD tests in tau decays with optimized perturbation expansion
P. A. Raczka
Abstract
The next-to-next-to-leading order perturbative QCD corrections to Rtau 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 Rtau and R12tau, to see how the use of the optimized expansion may affect the determination of the alphas and the dimension six condensates from the experimental data.
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