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(v)similar to v(4)/M-3, where v is the electroweak scale, rather than the conventional seesaw formula m(v similar to)v(2)/M. Such a mass relation is obtained via effective dimension seven operators LLHH(H dagger H)/M-3, which arise when an isospin 3/2 Higgs multiplet Phi is introduced along with isotriplet leptons. The masses of these particles are naturally in the TeV scale. The triply charged Higgs boson contained in Phi can be pair produced at the LHC and the Tevatron, with Phi(+++) decaying into W(+)l(+)l(+) or W+W+W+, possibly with displaced vertices. The leptonic decays of Phi(+++) 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.