Exploring Dimuon Higgs Decay in an Extended Scotogenic Model

TL;DR

This paper studies how an extended Scotogenic model can cause measurable deviations in the Higgs decay to muons, consistent with current experimental limits, and explores potential for future detection at the LHC.

Contribution

It introduces a new scalar in the Scotogenic model that allows for sizable Higgs to dimuon decay deviations while remaining consistent with existing experimental constraints.

Findings

Deviations in Higgs dimuon decay rate are possible within experimental bounds.

The model's predictions can be tested with future LHC precision measurements.

The extended model remains consistent with constraints from muon decay and Higgs photon decay.

Abstract

We investigate the dimuon Higgs decay $h \to \mu^+\mu^-$ in the context of an extended Scotogenic model. The model introduces a singlet complex scalar in addition to the standard Scotogenic scalar doublet and singlet fermions, charged under a dark $\mathbb{Z}_2$ symmetry. By exploring the one-loop contributions, we show that the model allows for sizable deviations in the Higgs dimuon decay rate, quantified by the quotient $R_{\mu\mu} = \text{Br}(h \to \mu^+\mu^-)/\text{Br}(h \to \mu^+\mu^-)_{\text{SM}}$. Crucially, these deviations comply with experimental limits, including those on $\text{Br}(\mu^{+} \to e^{+}\gamma)$ and $\text{Br}(h \to \gamma\gamma)$. Such deviations can be tested and constrained by future precision measurements at the LHC.