Scalar dark matter search from the extended $\nu$THDM

TL;DR

This paper explores a neutrino Two Higgs Doublet Model extended to include a scalar dark matter candidate, analyzing its relic density and detection prospects within a framework where neutrino masses are naturally small.

Contribution

It introduces a novel extension of the $ u$THDM with spontaneous $U(1)_X$ breaking that stabilizes a scalar dark matter particle and studies its phenomenological implications.

Findings

Dark matter candidate can account for observed relic density

Model predicts signals for direct detection experiments

Dark matter interactions influence indirect detection signals

Abstract

We consider a neutrino Two Higgs Doublet Model ($\nu$THDM) in which neutrinos obtain {\it naturally} small Dirac masses from the soft symmetry breaking of a global $U(1)_X$ symmetry. We extended the model so the soft term is generated by the spontaneous breaking of $U(1)_X$ by a new scalar field. The symmetry breaking pattern can also stabilize a scalar dark matter candidate. After constructing the model, we study the phenomenology of the dark matter: relic density, direct and indirect detection.