Renormalization group improvement of truncated perturbative series in QCD. Decays of tau-lepton and etac-charmonium
Abstract
We formulate a general scheme to improve the truncated perturbative expansion in alphas 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 etac-charmonium. The scale dependence of result for etac is studied in the scheme of fixed value for the MS-bar mass of charmed quark.
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