Scale setting for alpha_s beyond leading order

Details Scale setting for alpha_s beyond leading order Scale setting for alpha_s beyond leading order

2002-08-24

arxiv.org/abs/hep-ph/0208224v1

Phys.Rev. D67 (2003) 034023

Physics

High Energy Physics

High Energy Physics - Phenomenology

39 pages, 15 figures, 5 tables, LaTeX2e

Scientific paper

10.1103/PhysRevD.67.034023

We present a general procedure for incorporating higher-order information into the scale-setting prescription of Brodsky, Lepage and Mackenzie. In particular, we show how to apply this prescription when the leading coefficient or coefficients in a series in the strong coupling alpha_s are anomalously small and the original prescription can give an unphysical scale. We give a general method for computing an optimum scale numerically, within dimensional regularization, and in cases when the coefficients of a series are known. We apply it to the heavy quark mass and energy renormalization in lattice NRQCD, and to a variety of known series. Among the latter, we find significant corrections to the scales for the ratio of e+e- to hadrons over muons, the ratio of the quark pole to MSbar mass, the semi-leptonic B-meson decay width, and the top decay width. Scales for the latter two decay widths, expressed in terms of MSbar masses, increase by factors of five and thirteen, respectively, substantially reducing the size of radiative corrections.

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