The SU(3) L ⊗U(1) N electroweak model predicts new Higgs bosons beyond the one of the standard model. In this work we investigate the signature and production of doubly charged Higgs bosons in the e − e + International Linear Collider and in the CERN Linear Collider. We compute the branching ratios for the doubly charged gauge bosons of the model.

Using a peculiar version of the SU(3) L ⊗ U(1) N electroweak model, we investigate the production of doubly charged Higgs boson at the Large Hadron Collider. Our results include branching ratio calculations for the doubly charged Higgs and for one of the neutral scalar bosons of the model.

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We propose a scheme in which the masses of the heavier leptons obey seesaw type relations. The light lepton masses, except the electron and the electron neutrino ones, are generated by one loop level radiative corrections. We work in a version of the 3-3-1 electroweak model that predicts singlets (charged and neutral) of heavy leptons beyond the known ones. An extra U1 symmetry is introduced in order to avoid the light leptons getting masses at the tree level. The electron mass induces an explicit symmetry breaking at U1 . We discuss also the mixing matrix among four neutrinos. The new energy scale required is not higher than a few TeV.

We study the production and signatures of doubly charged Higgs bosons in the process γγ ↔ H −− H ++ at the e − e + International Linear Collider and CERN Linear Collider, where the intermediate photons are given by the Weizsäcker-Willians and laser backscattering distributions.