Hidden $U(1)$ gauge symmetry realizing a neutrinophilic two-Higgs-doublet model with dark matter

TL;DR

This paper introduces a neutrinophilic two-Higgs-doublet model with a hidden $U(1)$ gauge symmetry, naturally producing Dirac neutrinos and a fermionic dark matter candidate, with implications for dark matter relic density and detection.

Contribution

It presents a novel model combining a hidden $U(1)$ symmetry with a two-Higgs-doublet framework, generating Dirac neutrinos and stable dark matter through remnant symmetry.

Findings

Dark matter relic density within experimental bounds

Allowed dark matter mass range identified

Presence of a Goldstone boson affecting dark matter phenomenology

Abstract

We propose a neutrinophilic two Higgs doublet model with hidden local $U(1)$ symmetry, where active neutrinos are Dirac type, and a fermionic DM candidate is naturally induced as a result of remnant symmetry even after the spontaneous symmetry breaking. In addition, a physical Goldstone boson is arisen as a consequence of two types of gauge singlet bosons and contributes to the DM phenomenologies as well as additional neutral gauge boson. Then we will analyze the relic density of DM within the safe range of direct detection searches, and show the allowed region of dark matter mass.