Pade-improved extraction of alpha(s)(M-tau) from R-tau

Authors
Steele, TG Elias, V
Citation
Tg. Steele et V. Elias, Pade-improved extraction of alpha(s)(M-tau) from R-tau, MOD PHY L A, 13(39), 1998, pp. 3151-3159
Citations number
17
Categorie Soggetti
Physics
Journal title
MODERN PHYSICS LETTERS A
ISSN journal
02177323 → ACNP
Volume
13
Issue
39
Year of publication
1998
Pages
3151 - 3159
Database
ISI
SICI code
0217-7323(199812)13:39<3151:PEOAFR>2.0.ZU;2-P
Abstract
The perturbative series used to extract alpha(s)(M-tau) from the tau hadron ic width exhibits slow convergence. Asymptotic Pade-approximant and Pade su mmation techniques provide an estimate of these unknown higher-order effect s, leading to values for alpha(s)(M-tau) that are about 10% smaller than cu rrent estimates. Such a reduction improves the agreement of alpha(s)(M-tau) with the QCD evolution of the strong coupling constant from alpha(s)(M-z).