Primary Feynman rules to calculate the ε-dimensional integrand of any 1-loop amplitude

Abstract

When using dimensional regularization/reduction the ε-dimensional numerator of the 1-loop Feynman diagrams gives rise to rational contributions. I list the set of fundamental rules that allow the extraction of such terms at the integrand level in any theory containing scalars, vectors and fermions, such as the electroweak standard model, QCD and SUSY. © SISSA 2012.