Dark matter and a suppression mechanism for neutrino masses in the Higgs triplet model
Abstract
We extend the Higgs triplet model so as to include dark matter candidates and a simple suppression mechanism for the vacuum expectation value (vDelta) of the triplet scalar field. The smallness of neutrino masses can be naturally explained with the suppressed value of vDelta even when the triplet fields are at the TeV scale. The Higgs sector is extended by introducing Z2-odd scalars (an SU(2)L doublet eta and a real singlet s20) in addition to a Z2-even complex singlet scalar s10 whose vacuum expectation value violates the lepton number conservation by a unit. In our model, vDelta is generated by the one-loop diagram to which Z2-odd particles contribute. The lightest Z2-odd scalar boson can be a candidate for the dark matter. We briefly discuss a characteristic signal of our model at the LHC.
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