Published February 2000
| Version v1
Journal article
Asymptotic structure of perturbative series for τ lepton observables
- 1. Mainz Univ. (Germany). Inst. fuer Physik
- 2. Institute for Nuclear Research of the Russian Academy of Sciences, Moscow 117312 (Russian Federation)
Description
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.)
Additional details
Publishing Information
- Journal Title
- European Physical Journal. C
- Journal Volume
- 12
- Journal Issue
- 3
- Journal Page Range
- p. 461-467
- ISSN
- 1434-6044
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 31048638
- Subject category
- S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
- Descriptors DEI
- PERTURBATION THEORY; QUANTUM CHROMODYNAMICS
- Descriptors DEC
- FIELD THEORIES; QUANTUM FIELD THEORY
- Proposed descriptors and Free-text terms
- TAU LEPTONS; LEPTON DECAY; SEMILEPTONIC DECAYS; SERIES (MATHEMATICS); ASYMPTOTIC PERTURBATIVE SERIES; TAU LEPTON DECAY OBSERVABLES; TAU"- DECAY INTO TAU NEUTRINO+HADRONS; HADRONIC SPECTRAL DENSITY; SPECTRAL DENSITY MOMENTS; FINITE ORDER PERTURBATION THEORY; ALPHA_S"4 CORRECTIONS; PERTURBATIVE QCD; PERTURBATIVE QUANTUM CHROMODYNAMICS; SCHEME-INVARIANCE; ULTIMATE ACCURACY; OPTIMAL DECAY OBSERVABLES; DECAY RATE; DECAY WIDTH; INFRARED FIXED POINT
Optional Information
- Notes
- 27 refs.