arXiv:hep-ph/0205289·v2·High Energy Physics — Phenomenology
Power Counting in the Soft-Collinear Effective Theory
Christian W. Bauer🇺🇸 · Dan Pirjol🇺🇸 · Iain W. Stewart🇺🇸
Abstract
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 graphs in SCET 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 dynamical twist.
Comments: 12 pages, 1 fig, journal version