Charged Higgs contribution to $0\nu2\beta$ decay

TL;DR

This paper reevaluates the contribution of singly charged Higgs bosons to neutrinoless double beta decay, revealing that these contributions can be as significant as other known effects when considering QCD corrections and renormalization.

Contribution

It introduces a comprehensive analysis of charged Higgs effects on neutrinoless double beta decay, incorporating QCD corrections and renormalization group evolution, which were previously neglected.

Findings

Charged Higgs contributions can be as large as other effects.

Large cancellations between different contributions are possible.

Implications for neutrinoless double beta decay phenomenology.

Abstract

The singly charged Higgs boson contribution to $0\nu2\beta$ is neglected on grounds of couplings involving small masses and small nuclear matrix elements. We reconsider such contributions, but now in the light of QCD corrections and renormalization group evolution. It is found that the charged Higgs contribution is generically as large as (and at times significantly larger than) the other contributions and there can be large cancellations between contributions coming from different sources. This observation will have an important impact on the phenomenology.