QCD tests in tau decays with optimized perturbation expansion
Abstract
The next-to-next-to-leading order perturbative QCD corrections to R_tau 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_tau and R^12_tau, to see how the use of the optimized expansion may affect the determination of the alpha_s and the dimension six condensates from the experimental data.
Cite
@article{arxiv.hep-ph/9612345,
title = {QCD tests in tau decays with optimized perturbation expansion},
author = {P. A. Raczka},
journal= {arXiv preprint arXiv:hep-ph/9612345},
year = {2009}
}
Comments
6 pages in LateX, 4 PostScript figures embedded in text, uses espcrc2.sty (included), to appear in the Proceedings of the Fourth International Workshop on Tau Lepton Physics, 16-19 September 1996, Estes Park, Colorado, U.S.A