Higgs triplets at like-sign linear colliders and neutrino mixing

We study the phenomenology of the type-II seesaw model at a linear e{sup -}e{sup -} collider. We show that the process e{sup -}e{sup -}{yields}{alpha}{sup -}{beta}{sup -} ({alpha}, {beta}=e, {mu}, {tau} being charged leptons) mediated by a doubly charged scalar is very sensitive to the neutrino parameters, in particular, the absolute neutrino mass scale and the Majorana CP-violating phases. We identify the regions in parameter space in which appreciable collider signatures in the channel with two like-sign muons in the final state are possible. This includes Higgs triplet masses beyond the reach of the LHC.

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