Probing the type-II seesaw mechanism through the production of Higgs bosons at a lepton collider

We investigate the production and decays of doubly-charged Higgs bosons for the Type-II seesaw mechanism at an e(+)e(-) collider with two center of mass energies, root s = 380 GeV and 3 TeV, and analyze the fully hadronic final states in detail. Lower mass ranges can be probed during the 380 GeV run of the collider, while high mass ranges, which are beyond the 13 TeV Large Hadron Collider discovery reach, can be probed with root s = 3 TeV. For such a heavy Higgs boson, the final decay products are collimated, resulting in fat-jets. We perform a substructure analysis to reduce the background and find that a doublycharged Higgs boson in the mass range 800-1120 GeV can be discovered during the 3 TeV run, with integrated luminosity L similar to 95 fb(-1) of data. For 380 GeV center of mass energy, we find that for the doubly-charged Higgs boson in the range 160-172 GeV, a 5 sigma significance can be achieved with only integrated luminosity L similar to 24 fb(-1). Therefore, a light Higgs boson can be discovered immediately during the run of a future ethorne-collider.