Scale setting for αs beyond leading order

被引:7
作者
Hornbostel, K [1 ]
Lepage, GP
Morningstar, C
机构
[1] So Methodist Univ, Dallas, TX 75275 USA
[2] Cornell Univ, Newman Lab Nucl Studies, Ithaca, NY 14853 USA
[3] Carnegie Mellon Univ, Pittsburgh, PA 15213 USA
关键词
D O I
10.1016/S0920-5632(01)00871-4
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
We present a general procedure for applying the scale-setting prescription of Brodsky, Lepage and Mackenzie to higher orders in the strong coupling constant 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, within dimensional regularization, and in cases when the coefficients of a series are known. We find significant corrections to the scales for Re+e-, Gamma (B --> X(u)e<(<nu>)over bar>), Gamma (t --> bW), and the ratios of the quark pole to (MS) over bar and lattice bare masses.
引用
收藏
页码:579 / 583
页数:5
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