Radiative neutrino mass generation from WIMP dark matter

TL;DR

This paper proposes a model where neutrino masses are generated radiatively via interactions involving electroweak singlet and triplet fermions, which also serve as dark matter candidates detectable through direct detection and collider experiments.

Contribution

It introduces a minimal extension with radiative neutrino mass generation involving electroweak fermions and links it to a viable dark matter candidate with observable signals.

Findings

Reproduces correct relic density for GeV-TeV masses.

Predicts detectable signals in direct detection experiments.

Fermion triplet component can be observed at colliders.

Abstract

The minimal seesaw extension of the Standard Model requires two electroweak singlet fermions in order to accommodate the neutrino oscillation parameters at tree level. Here we consider a next to minimal extension where light neutrino masses are generated radiatively by two electroweak fermions: one singlet and one triplet under SU(2). These should be odd under a parity symmetry and their mixing gives rise to a stable weakly interactive massive particle dark matter candidate. For mass in the GeV-TeV range, it reproduces the correct relic density, and provides an observable signal in nuclear recoil direct detection experiments. The fermion triplet component of the dark matter has gauge interactions, making it potentially detectable at present and near future collider experiments.