Asymptotic structure of perturbative series for tau lepton observables
arXiv:hep-ph/9909225 · doi:10.1007/s100529900279
Abstract
We analyze tau lepton decay observables, namely moments of the hadronic spectral density in the finite energy interval (0,M_τ), within finite order perturbation theory including α_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.
arXiv comment21 pages