Using recently developed methods for the evaluation of five-loop amplitudes in perturbative
QCD, corrections of order α s 4 for the nonsinglet part of the cross section for electron …

In this work radiative corrections in the total hadronic decay rate of the τ lepton and some
moments of its differential distributions are studied employing perturbative QCD and the …

We present an analysis of the m_s^2-corrections to Cabibbo-suppressed τ-lepton decays
employing contour improved resummation within an effective scheme which is an essential …

The singular part of the Borel transform of a QCD amplitude near the infrared renormalon
can be expanded in terms of higher order Wilson coefficients of the operators associated …

Recently computed terms of order O (α s 4 nf 2) in the perturbative series for the τ decay rate,
and similar (new) strange quark mass corrections, are used to discuss the validity of various …

Using recently developed methods for the evaluation of five-loop amplitudes in perturbative
QCD, corrections of order alpha_s^ 4 for the cross section of electron-positron annihilation …

A numerical value for the running electromagnetic-coupling constant in the MS scheme is
calculated at a low-energy normalization scale equal to the τ-lepton mass M τ. This low …

We extract a numerical value for the strong coupling constant α s from the τ-lepton decay
rate into nonstrange particles. A new feature of our procedure is the explicit use of …

We introduce an optimal renormalization group analysis pertinent to the analysis of
polarization functions associated with the s-quark mass relevant in τ-decay. The technique is …

A modified Borel transform of the Adler function is used to resum the hadronic tau decay
width ratio. In contrast with the ordinary Borel transform, the integrand of the Borel integral is …