Neutrino masses in the Standard Model effective field theory

We compute the leading-logarithmic correction to the neutrino mass matrix in the Standard Model effective field theory (SMEFT) to dimension seven. In the limit of negligible lepton and down-type quark Yukawa couplings, it receives contributions from the Weinberg dimension-five operator as well as fr...

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Published in:Physical review. D 2021-08, Vol.104 (3), p.1, Article 035002
Main Authors: Chala, Mikael, Titov, Arsenii
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Language:English
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Couplings
Field theory
Leptons
Mass matrix
Neutrinos
Operators
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description We compute the leading-logarithmic correction to the neutrino mass matrix in the Standard Model effective field theory (SMEFT) to dimension seven. In the limit of negligible lepton and down-type quark Yukawa couplings, it receives contributions from the Weinberg dimension-five operator as well as from 11 dimension-six and five dimension-seven independent interactions. Two of the main implications we derive from this result are the following. First, we find dimension-seven operators which, despite violating lepton number, do not renormalize neutrino masses at one loop. And second, we demonstrate that the presence of dimension-six operators around the TeV scale can modify the Standard Model prediction by up to O(50%). Our result comprises also one step forward towards the renormalization of the SMEFT to order v3/Λ3.
doi_str_mv 10.1103/PhysRevD.104.035002
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subjects Couplings
Field theory
Leptons
Mass matrix
Neutrinos
Operators
title Neutrino masses in the Standard Model effective field theory
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