# New model for radiatively generated Dirac neutrino masses and lepton flavor violating decays of the Higgs boson

## TL;DR

This paper introduces a new two-loop mechanism for generating Dirac neutrino masses that conserves lepton number and involves dark matter, predicting potentially observable lepton flavor violating Higgs decays.

## Contribution

The paper presents a novel model for neutrino mass generation that allows large lepton flavor violating Higgs decays without conflicting with existing constraints.

## Key findings

- Lepton flavor violating Higgs decays can be significantly larger than charged lepton decays.
- The model remains consistent with current neutrino, lepton flavor violation, and dark matter constraints.
- Future collider observations of Higgs decays could support this model.

## Abstract

We propose a new mechanism to explain neutrino masses with lepton number conservation, in which the Dirac neutrino masses are generated at the two-loop level involving a dark matter candidate. In this model, branching ratios of lepton flavor violating decays of the Higgs boson can be much larger than those of lepton flavor violating decays of charged leptons. If lepton flavor violating decays of the Higgs boson are observed at future collider experiments without detecting lepton flavor violating decays of charged leptons, most of the models previously proposed for tiny neutrino masses are excluded while our model can still survive. We show that the model can be viable under constraints from current data for neutrino experiments, searches for lepton flavor violating decays of charged leptons and dark matter experiments.