2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/191863We 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.12 pages, 2 figures; v2: minor typos corrected and clarifications added, published versionHigh Energy Physics - TheoryHigh Energy Physics - Phenomenologytext