Remark on the perturbative component of inclusive $τ$-decay

Abstract

In the context of the inclusive $τ$-decay, we analyze various forms of perturbative expansions which have appeared as modifications of the original perturbative series. We argue that analytic perturbation theory, which combines renormalization-group invariance and $Q^2$-analyticity, has significant merits favoring its use to describe the perturbative component of $τ$-decay.