Asymptotic structure of perturbative series for tau lepton observables

Details Asymptotic structure of perturbative series for tau lepton observables Asymptotic structure of perturbative series for tau lepton observables

1999-09-02

arxiv.org/abs/hep-ph/9909225v1

Eur.Phys.J.C12:461-467,2000

Physics

High Energy Physics

High Energy Physics - Phenomenology

21 pages

Scientific paper

10.1007/s100529900279

We analyze tau lepton decay observables, namely moments of the hadronic spectral density in the finite energy interval (0,M_\tau), within finite order perturbation theory including \alpha_s^4 corrections. The start of asymptotic growth of 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.

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