Neutrino Mass Operators of Dimension up to Nine in Two-Higgs-doublet Model

TL;DR

This paper classifies higher-dimensional neutrino mass operators up to dimension nine within a two-Higgs-doublet model, highlighting operators that could influence neutrino mass generation beyond the standard dimension-five operators.

Contribution

It provides a comprehensive list of independent higher-dimensional neutrino mass operators up to dimension nine using Young tableau, including gauge boson-involving operators that violate lepton number.

Findings

List of independent operators up to dimension nine.

Identification of lowest dimension seven operators with gauge bosons.

Discussion of potential phenomenological implications.

Abstract

We study higher-dimensional neutrino mass operators in a low energy theory that contains a second Higgs doublet, the two Higgs doublet model. The operators are relevant to underlying theories in which the lowest dimension-five mass operators would not be induced. We list the independent operators with dimension up to nine with the help of Young tableau. Also listed are the lowest dimension seven operators that involve gauge bosons and violate the lepton number by two units. We briefly mention some of possible phenomenological implications.