One-loop matching conditions in neutrino effective theory

We investigate matching conditions and threshold corrections between full and effective theories based on the type I seesaw mechanism. In general, using an intuitive Feynman diagrammatical approach, we compute the amplitudes before and after integrating out heavy right-handed neutrinos at the matching scale. In particular, we derive the one-loop matching conditions between the full and the effective theories. The matching conditions of the parameters are influenced by one-loop corrections to the corresponding vertices as well as wave function corrections for the Higgs and the lepton fields. Our results are comparable to earlier results based on a functional approach. (c) 2022 The Author(s). Published by Elsevier B.V.

Automated summary

This article investigates matching conditions and threshold corrections between full and effective theories based on the type I seesaw mechanism. Using an intuitive Feynman diagrammatical approach, the amplitudes before and after integrating out heavy right-handed neutrinos at the matching scale are computed. The one-loop matching conditions between the full and the effective theories are derived. The matching conditions of the parameters are influenced by one-loop corrections to the corresponding vertices as well as wave function corrections for the Higgs and the lepton fields. The results are comparable to earlier results based on a functional approach.