Dark matter assisted lepton anomalous magnetic moments and neutrino masses

TL;DR

This paper introduces a model linking neutrino masses, dark matter, and lepton magnetic moments, explaining observed anomalies and providing testable predictions for collider experiments.

Contribution

It presents a novel framework where neutrino masses and lepton AMMs are generated at one-loop level via new BSM states, incorporating dark matter stability and addressing experimental discrepancies.

Findings

Model successfully explains electron and muon AMM discrepancies.

Fits neutrino mass and mixing data within the proposed framework.

Explores dark matter phenomenology and collider signatures.

Abstract

We propose a framework that addresses the origin of neutrino mass, explains the observed discrepancies in the electron and the muon anomalous magnetic moments (AMMs) data and incorporates the dark matter (DM) relic abundance. Both the neutrino mass and the lepton AMMs are generated at one-loop level mediated by a common set of beyond the Standard Model (SM) states. In this class of models, the SM is extended with vector-like charged fermion and scalar multiplets, all odd under an imposed $\mathcal{Z}_2$ symmetry, which stabilizes the fermionic or scalar DM candidate residing in one of them. Two scalar multiplets appear in the AMM loops, thus allowing for different signs of their contributions, in agreement with the observed discrepancies which are of opposite sign for electron and muon. The vector-like fermions give rise to large new physics contributions to the lepton AMMs via chirally enhanced terms that are proportional to their mass. To demonstrate the viability of this framework, we perform a detailed study of a particular model for which a fit to the neutrino masses and mixing together with lepton AMMs are provided. Furthermore, DM phenomenology and collider signatures are explored.