Soft-Collinear Factorization in Effective Field Theory
High Energy Physics - Phenomenology
2008-11-26 v2
Abstract
The factorization of soft and ultrasoft gluons from collinear particles is shown at the level of operators in an effective field theory. Exclusive hadronic factorization and inclusive partonic factorization follow as special cases. The leading order Lagrangian is derived using power counting and gauge invariance in the effective theory. Several species of gluons are required, and softer gluons appear as background fields to gluons with harder momenta. Two examples are given: the factorization of soft gluons in B->D pi, and the soft-collinear convolution for the B->Xs gamma spectrum.
Cite
@article{arxiv.hep-ph/0109045,
title = {Soft-Collinear Factorization in Effective Field Theory},
author = {Christian W. Bauer and Dan Pirjol and Iain W. Stewart},
journal= {arXiv preprint arXiv:hep-ph/0109045},
year = {2008}
}
Comments
32 pages, 11 figs, journal version