Power Counting in the Soft-Collinear Effective Theory
High Energy Physics - Phenomenology
2009-11-07 v2
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.
Cite
@article{arxiv.hep-ph/0205289,
title = {Power Counting in the Soft-Collinear Effective Theory},
author = {Christian W. Bauer and Dan Pirjol and Iain W. Stewart},
journal= {arXiv preprint arXiv:hep-ph/0205289},
year = {2009}
}
Comments
12 pages, 1 fig, journal version