Massive Loop Amplitudes from Unitarity
High Energy Physics - Phenomenology
2008-11-26 v2 High Energy Physics - Theory
Abstract
We show, for previously uncalculated examples containing a uniform mass in the loop, that it is possible to obtain complete massive one-loop gauge theory amplitudes solely from unitarity and known ultraviolet or infrared mass singularities. In particular, we calculate four-gluon scattering via massive quark loops in QCD. The contribution of a heavy quark to five-gluon scattering with identical helicities is also presented.
Cite
@article{arxiv.hep-ph/9511336,
title = {Massive Loop Amplitudes from Unitarity},
author = {Z. Bern and A. G. Morgan},
journal= {arXiv preprint arXiv:hep-ph/9511336},
year = {2008}
}
Comments
Minor modifications, 27 pages including two figures