Abstract
We investigate the collider phenomenology of the scalar triplet particles in the Type-II seesaw model at a 100 TeV pp collider. Depending on triplet vacuum expectation value vΔ, the dominant discovery channels could be H++H−− and H±±H∓. We find the H±±H∓ → W±W±hW∓/ℓ±ℓ±hW∓ channels are promising for both model discovery at relatively large vΔ and determination of the Higgs portal couplings λ4 and λ5. We also find that these two channels are complementary to indirect determination of λ4 from future precise measurements on h → γγ decay rate. Together with pair production of the doubly-charged Higgs subsequently decaying into same-sign di-leptons, the H±±H∓ channels have the potential to cover a significant portion of the parameter space of the Type-II seesaw complex scalar triplet model.
Highlights
Explaining the origin of neutrino masses is a key open problem in particle physics
We find that using their input, only when v∆ 1 GeV will the value of λ3 respect perturbativity, whereas for smaller v∆’s, λ3 can be as large as 1021
We show the regions of parameter space where the H± decay branching ratio (BR) to various final states is greater than 40%
Summary
Explaining the origin of neutrino masses is a key open problem in particle physics. The significant difference in magnitudes between the masses of the charged and neutral leptons suggests that the dynamics responsible for the observed light neutrino masses, generically denoted here as mν, are different than those of the Standard Model (SM) Higgs mechanism. Theorists have considered lower scale variants with MN at the TeV scale or below, a possibility that allows for more direct experimental tests, including the observation of the RH neutrinos in high energy collider searches or beam dump experiments In this case, the scale of the relevant Yukawa couplings need not be too different from those of the charged leptons. Given the higher center of mass energy and prospective integrated luminosity, a 100 TeV pp collider will provide coverage for a considerably larger portion of model parameter space than is feasible with the Large Hadron Collider (LHC). For triplet scalar masses below roughly one TeV, the prospective future collider (circular e+e− and pp) measurements of the Higgs di-photon decay rate could yield significant constraints on the values or the Higgs portal coupling needed for discovery of the H±±H∓ → W ±W ±hW ∓/ ± ±hW ∓ modes.
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