WIMP dark matter as radiative neutrino mass messenger

TL;DR

This paper proposes a minimal extension of the Standard Model where radiative neutrino masses are generated by electroweak fermions, which also serve as WIMP dark matter candidates detectable via direct detection and collider experiments.

Contribution

It introduces a novel radiative neutrino mass model with electroweak fermions that simultaneously explain dark matter and neutrino oscillations.

Findings

Reproduces correct relic density for GeV-TeV mass range.

Predicts observable signals in direct detection experiments.

Fermion triplet component is detectable at colliders.

Abstract

The minimal seesaw extension of the Standard SU(3) x SU(2) x U(1) 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 (WIMP) 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 also detectable at present and near future collider experiments.