Global analysis of a minimally extended scotogenic model

Abstract

We perform a global analysis of a minimally extended scotogenic model motivated by observed non-zero neutrino masses, viable dark matter (DM) candidates, and the instability of the Standard Model (SM) vacuum at high-energies. We examine the bounded-from-below conditions, vacuum stability, and RG-driven perturbativity bounds arising from the extended scalar sector, alongside a comprehensive set of flavor and electroweak (EW) precision observables - including the muon anomalous magnetic moment $Δa_μ$, the radiative decays $\ell_α \rightarrow \ell_β γ$ and $\ell_α \rightarrow 3\ell_β$, and the $μ\rightarrow e$ conversion rate, the oblique parameters, and leptonic decays of $Z$ and $H$ bosons. A numerical scan reveals four notable features: the DESI BAO bound would rule out the inverted hierarchy if confirmed by other experiments; the oblique parameters are projected to be within the reach of future precision measurements; the viable fermionic DM candidate mass lies in the range $120-350 \func{GeV}$, while the CP-odd scalar is constrained to $350-600 \func{GeV}$; and our result on $Z \rightarrow \func{Invisible}$ is compatible with the world average at the $3σ$ level and is favored by the recent ATLAS measurement at the $3σ$ level.