Asymptotic structure of perturbative series for tau lepton observables

Authors
Korner, JG Krajewski, F Pivovarov, AA
Citation
Jg. Korner et al., Asymptotic structure of perturbative series for tau lepton observables, EUR PHY J C, 12(3), 2000, pp. 461-467
Citations number
37
Categorie Soggetti
Physics
Journal title
EUROPEAN PHYSICAL JOURNAL C
ISSN journal
14346044 → ACNP
Volume
12
Issue
3
Year of publication
2000
Pages
461 - 467
Database
ISI
SICI code
1434-6044(200002)12:3<461:ASOPSF>2.0.ZU;2-V
Abstract
We analyze tau lepton dccay observables, namely the moments of the hadronic spectral density in the finite energy interval (0, M-tau), within finite o rder perturbation theory including alpha(s)(4) corrections. The start of th e asymptotic growth of the perturbation theory series is found at this orde r in a scheme-invariant manner. We establish the ultimate accuracy of finit e order perturbation theory predictions and discuss the construction of opt imal observables.