Six-Higgs-doublet model for dark matter

Abstract

We consider an extension of the Higgs sector in the standard model (SM) with six Higgs doublets. The gauge couplings are unified without supersymmetry in this model. The lightest of the extra Higgs particles, being stabilized by a discrete symmetry imposed from the outset, presents a plausible candidate for dark matter. For a specific acceptable benchmark point, we show that the model is viable regarding the constraints of relic density, direct detection and invisible Higgs decay. We comment on the mean free path of the dark matter candidate.

Computable conditions for order-2 CP symmetry in NHDM potentials

“…Below are the numerical values for the parameter point used in the example analyzed in section 4.3. All the non-zero elements are listed, except those which can be obtained by JHEP05(2024)260 3,4,5,6,22,23,24,25,26,27, 8,10,11,12,15,28,29,31,32,33,36,40,41,42, 16,17,19,20,21,34,37,38, Open Access. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.…”

“…5HDMs in the context of higher order CP s were scrutinized in [9]. A 6HDM for Dark Matter was examined in [19], and Grand Unified Theories with eight and nine Higgs doublets were studied in [20] and [21], respectively. Moreover, in the "Private Higgs" extension of the SM each charged fermion acquire mass from its own Higgs doublet, through O(1) Yukawa couplings, and is hence another example of a model with N = 9 Higgs doublets [22,23].…”