QCD tests in tau decays with optimized perturbation expansion
Raczka, P. A.
Original · EN
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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