Power counting in the soft-collinear effective theory

被引：40
|
作者：
Bauer, CW [1 ]
Pirjol, D
Stewart, IW
机构：
[1] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA
[2] Univ Washington, Inst Nucl Theory, Seattle, WA 98195 USA
来源：
PHYSICAL REVIEW D | 2002年 / 66卷 / 05期
关键词：
D O I：
10.1103/PhysRevD.66.054005
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We describe in some detail the derivation of a power counting formula for the soft-collinear effective theory (SCET). This formula constrains which operators are required to correctly describe the infrared at any order in the Lambda(QCD)/Q expansion (lambda expansion). The result assigns a unique lambda dimension to SCET graphs solely from vertices, is gauge independent, and can be applied independent of the process. For processes with an OPE the lambda dimension has a correspondence with a dynamical twist.
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页数：7
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