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[en] We analyze τ lepton decay observables, namely the moments of the hadronic spectral density in the finite energy interval (0,Mτ), within finite order perturbation theory including αs4 corrections. The start of the asymptotic growth of the perturbation theory series is found at this order in a scheme-invariant manner. We establish the ultimate accuracy of finite order perturbation theory predictions and discuss the construction of optimal observables. (orig.)
Journal
European Physical Journal. C; ISSN 1434-6044; 
; v. 12(3); p. 461-467
; v. 12(3); p. 461-467