Dark matter and neutrino masses from a scale-invariant multi-Higgs portal

Abstract

We consider a classically scale invariant version of the Standard Model, extended by an extra dark $SU(2{)}_X$ gauge group. Apart from the dark gauge bosons and a dark scalar doublet which is coupled to the Standard Model Higgs through a portal coupling, we incorporate right-handed neutrinos and an additional real singlet scalar field. After symmetry breaking à la Coleman-Weinberg, we examine the multi-Higgs sector and impose theoretical and experimental constraints. In addition, by computing the dark matter relic abundance and the spin-independent scattering cross section off a nucleon we determine the viable dark matter mass range in accordance with present limits. The model can be tested in the near future by collider experiments and direct detection searches such as XENON 1T.

28 pages, 9 figures. References added, typos fixed; matches version published in PRD

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