Renormalization group improvement of truncated perturbative series in QCD. Decays of tau-lepton and eta_c-charmonium

Details Renormalization group improvement of truncated perturbative series in QCD. Decays of tau-lepton and eta_c-charmonium Renormalization group improvement of truncated perturbative series in QCD. Decays of tau-lepton and eta_c-charmonium

2002-11-16

arxiv.org/abs/hep-ph/0211261v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, LaTeX file, 2 eps-figyres, referense added

Scientific paper

We formulate a general scheme to improve the truncated perturbative expansion
in alpha_s by means of the renormalization group in QCD for the single-scale
quantities. The procedure is used for the evaluation of hadronic decay rates of
tau-lepton and eta_c-charmonium. The scale dependence of result for eta_c is
studied in the scheme of fixed value for the MS-bar mass of charmed quark.

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