Selection rules for helicity amplitudes in massive gauge theories
High Energy Physics - Phenomenology
2013-05-30 v3 High Energy Physics - Theory
Abstract
After a rediscussion of the vanishing theorems for helicity amplitudes in unbroken gauge theories, we study the case of spontaneously broken gauge theories at high energy. The vanishing theorems generalize to a definite pattern of m/E-suppression of the amplitudes that vanish in the massless case, where E is the energy scale of the process and m is the mass of the gauge vectors. We use only elementary arguments, and as an application we show how these methods can be employed to understand some aspects of the effective W approximation in the polarized case.
Cite
@article{arxiv.1211.1880,
title = {Selection rules for helicity amplitudes in massive gauge theories},
author = {Francesco Coradeschi and Paolo Lodone},
journal= {arXiv preprint arXiv:1211.1880},
year = {2013}
}
Comments
18 pages. v2: minor modifications. v3: published version