Scale setting for alpha(s) beyond leading order

Citation
K. Hornbostel et al., Scale setting for alpha(s) beyond leading order, NUCL PH B-P, 94, 2001, pp. 579-583
Citations number
14
Categorie Soggetti
Physics
Journal title
NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS
ISSN journal
09205632 → ACNP
Volume
94
Year of publication
2001
Pages
579 - 583
Database
ISI
SICI code
0920-5632(200103)94:<579:SSFABL>2.0.ZU;2-H
Abstract
We present a general procedure for applying the scale-setting prescription of Brodsky, Lepage and Mackenzie to higher orders in the strong coupling co nstant as. In particular, rye show how to apply this prescription when the leading coefficient or coefficients in a series in a, are anomalously small . We give a general method for computing an optimum scale numerically, with in dimensional regularization, and in cases when the coefficients of a seri es are known. We find significant corrections to the scales for Re+e-, Gamm a (B --> X(u)e<(<nu>)over bar>), Gamma (t --> bW), and the ratios of the qu ark pole to (MS) over bar and lattice bare masses.