Higgs triplets at like-sign linear colliders and neutrino mixing

TL;DR

This paper explores how a linear e^-e^- collider can detect signals from Higgs triplets in the type-II seesaw model, providing insights into neutrino properties beyond current collider capabilities.

Contribution

It demonstrates the sensitivity of like-sign dilepton production at linear colliders to neutrino mass parameters and Majorana phases, extending the search for Higgs triplets.

Findings

Collider signatures depend on neutrino parameters.

Potential to detect Higgs triplets beyond LHC reach.

Like-sign muon channels are particularly promising.

Abstract

We study the phenomenology of the type-II seesaw model at a linear e^-e^- collider. We show that the process e^-e^- \rightarrow alpha^-beta^- (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.