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PHYSICAL REVIEW D 88, 095014 (2013)


3-3-1 model with inert scalar triplet

P.V. Dong,T. Phong Nguyen, D.V. Soa

We show that the typical 3-3-1 models are only self-consistent if they contain interactions that explicitly violate the lepton number. The 3-3-1 model with right-handed neutrinos can by itself work as an economical 3-3-1 model as a natural recognition of the above criteria, while it also produces an inert scalar triplet () responsible for dark matter. This is ensured by a Z2 symmetry (assigned so that only  is odd while all other multiplets which perform the economical 3-3-1 model are even), which is not broken by the vacuum. The minimal 3-3-1 model can provide dark matter by a similar realization. Taking the former into account, we show that the dark matter candidate (H) contained in  transforms as a singlet in the effective limit under the standard model symmetry and is naturally heavy. The H relic density and direct detection cross section will have the correct values when the mass of H is in TeV range, as expected. The model predicts the H mass mH ¼ 5  2 TeV and the H-nucleon scattering cross section HN ¼ 1:56  1044 cm2, provided that the new neutral Higgs boson is much heavier than the dark matter.

DOI: 10.1103/PhysRevD.88.095014

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