Simple Rules for Evanescent Operators in One-Loop Basis Transformations

Abstract

The basis transformations of the effective operators often involve Fierz and other relations which are only valid in $D=4$ space-time dimensions. In general, in $D$ space-time dimensions, however, the evanescent operators have to be introduced to preserve such identities. Such operators contribute to one-loop basis transformations as well as to two-loop renormalization group running. In this talk, I discussed a simple procedure for systematically changing of basis at 1-loop level including shifts due to evanescent operators. As an example, we apply this method to derive the 1-loop basis transformation from the BMU basis useful for NLO QCD calculations, to the JMS basis used in the matching to the SMEFT.