Infrared regulators and SCETII
High Energy Physics - Phenomenology
2009-11-10 v2
Abstract
We consider matching from SCETI, which includes ultrasoft and collinear particles, onto SCETII with soft and collinear particles at one loop. Keeping the external fermions off their mass shell does not regulate all IR divergences in both theories. We give a new prescription to regulate infrared divergences in SCET. Using this regulator, we show that soft and collinear modes in SCETII are sufficient to reproduce all the infrared divergences of SCETI. We explain the relationship between IR regulators and an additional mode proposed for SCETII.
Cite
@article{arxiv.hep-ph/0312302,
title = {Infrared regulators and SCETII},
author = {Christian W. Bauer and Matthew P. Dorsten and Michael P. Salem},
journal= {arXiv preprint arXiv:hep-ph/0312302},
year = {2009}
}
Comments
9 pages. Added discussion about relationship between IR regulators and messenger modes