Abstract
The lepton-number-violating decays of singly-charged Higgs bosons H± are investigated in the minimal type-(I + II) seesaw model with one SU(2)L Higgs triplet Δ and one heavy Majorana neutrino N1 at the TeV scale. We find that the branching ratios B(H+ → lα+ν̄) (for α = e,μ,τ) depend not only on the mass and mixing parameters of three light neutrinos νi (for i = 1,2,3) but also on those of N1. Assuming that the mass of N1 lies in the range of 200 GeV to 1 TeV, we figure out the generous interference bands for the contributions of νi and N1 to B(H+ → lα+ν̄). We illustrate some salient features of such interference effects by considering three typical mass patterns of νi, and show that the relevant Majorana CP-violating phases can affect the magnitudes of B(H+ → lα+ν̄) in this parameter region.
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