Lepton number violation and $h\to \gamma\gamma$ in a radiative inverse seesaw dark matter model

TL;DR

This paper explores a radiative inverse seesaw dark matter model where neutrino masses are generated at two loops, predicting observable lepton flavor violation and modifications to Higgs decay, with potential tests at future experiments and the LHC.

Contribution

It introduces a novel radiative inverse seesaw model that links neutrino mass generation, dark matter, and Higgs decay anomalies, with testable predictions for lepton flavor violation and collider signatures.

Findings

Future experiments can test the model via $oldsymbol{ ext{μ} o e ext{γ}}$ and $oldsymbol{ ext{μ} - e}$ conversion.

The model can explain the observed deviation in $oldsymbol{h o oldsymbol{ ext{γ} ext{γ}}}$ decay rate.

New charged particles significantly impact Higgs decay and collider signatures.

Abstract

We study phenomenological implications of a radiative inverse seesaw dark matter model. In this model, because neutrino masses are generated at two loop level with inverse seesaw, the new physics mass scale can be as low as a few hundred GeV and the model also naturally contain dark matter candidate. The Yukawa couplings linking the SM leptons and new particles can be large. This can lead to large lepton flavor violating effects. We find that future experimental data on $\mu \to e \gamma$ and $\mu - e$ conversion can further test the model. The new charged particles can affect significantly the $h \to \gamma \gamma$ branching ratio in the SM. The model is able to explain the deviation between the SM prediction and the LHC data. We also study some LHC signatures of the new particles in the model.