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We study Higgs and dark matter physics in the type-II two-Higgs-doublet model(2HDM) with an extra U(1)_H gauge symmetry, inspired by the E_6 grand unifiedtheory (GUT). From the viewpoint of the bottom-up approach, the additionalU(1)_H gauge symmetry plays a crucial role in avoiding the tree-level flavorchanging neutral currents mediated by neutral Higgs bosons in general 2HDMs. Inthe model with U(1)_H gauge symmetry, which has Type-II Yukawa couplings, wehave to introduce additional chiral fermions that are charged under the U(1)_Hgauge symmetry as well as under the Standard-Model (SM) gauge symmetry in orderto cancel chiral gauge anomalies. For the U(1)_H charge assignment and theextra matters, we adopt the ones inspired by the E_6 GUT: the extra quark-likeand lepton-like fermions with the non-trivial U(1)_H charges. We discuss theircontributions to the physical observables, such as the measurements of Higgsphysics and electro-weak interactions, and investigate the consistency with theexperimental results. Furthermore, we could find extra neutral particles likethe SM neutrinos after the electro-weak symmetry breaking, and they could bestable, because of the remnant symmetry after U(1)_H symmetry breaking. We alsodiscuss the thermal relic density and the (in)direct-detections of this darkmatter candidate.

Higgs and Dark Matter Physics in the Type-II Two-Higgs-Doublet Model inspired by E_6 GUT