New mechanism for neutrino mass generation and triply charged Higgs bosons at the LHC

We propose a new mechanism for generating small neutrino masses which predicts the relation m_ν∼v⁴/M³, where v is the electroweak scale, rather than the conventional seesaw formula m_ν∼v²/M. Such a mass relation is obtained via effective dimension seven operators LLHH(H^†H)/M³, which arise when an isospin 3/2 Higgs multiplet Φ is introduced along with isotriplet leptons. The masses of these particles are naturally in the TeV scale. The triply charged Higgs boson contained in Φ can be pair produced at the LHC and the Tevatron, with Φ⁺⁺⁺ decaying into W⁺ℓ⁺ℓ⁺ or W⁺W⁺W⁺, possibly with displaced vertices. The leptonic decays of Φ⁺⁺⁺ will help discriminate between normal and inverted hierarchies of neutrino masses. This scenario also allows for raising the standard Higgs boson mass to values in excess of 500 GeV.