CSW rules for a massive scalar
High Energy Physics - Theory
2008-11-26 v2 High Energy Physics - Phenomenology
Abstract
We derive the analog of the Cachazo-Svrcek-Witten (CSW) diagrammatic Feynman rules for four dimensional Yang-Mills gauge theory coupled to a massive colored scalar. The mass term is shown to give rise to a new tower of vertices in addition to the CSW vertices for massless scalars in non-supersymmetric theories. The rules are derived directly from an action, once through a canonical transformation within light-cone Yang-Mills and once by the construction of a twistor action. The rules are tested against known results in several examples and are used to simplify the proof of on-shell recursion relations for amplitudes with massive scalars.
Keywords
Cite
@article{arxiv.0712.3409,
title = {CSW rules for a massive scalar},
author = {Rutger Boels and Christian Schwinn},
journal= {arXiv preprint arXiv:0712.3409},
year = {2008}
}
Comments
12 pages, 2 figures; v2: minor typos corrected and clarifications added, published version