Abstract
We study the phenomenology of scotogenic model in the case of Majorana Dark Matter (DM) candidate. This scenario gives important consequences since the parameter space of the model is almost unconstrained compared to the Inert Higgs Doublet Model (or the scotogenic model with scalar DM), and hence, offers new opportunities for discovery at future high energy collider, e.g. the HL-LHC. As an example, we focus on the production of the Standard Model (SM) Higgs boson in association with a pair of dark scalars. Owing to its clean signature, the $\gamma\gamma$ decay channel of the SM Higgs boson is investigated in great detail at both the HL-LHC (at $\sqrt{s}=14$ TeV) and the future FCC-hh (at $\sqrt{s}=100$ TeV). After revisiting the LHC constraints from run-II on the parameter space of the model, and selecting benchmark points satisfying all the theoretical and experimental constraints, we found that scalars with mass up to $140$ GeV ($160$ GeV) can be probed at the LHC (FCC-hh) with a $3$ ab$^{-1}$ of integrated luminosity assuming $5\%$ of uncertainty.
Highlights
The observation of neutrino oscillations in solar, atmospheric, reactor, and accelerator experiments remains one clear indication that the Standard Model (SM) is not a complete framework of fundamental physics
This region of parameter space corresponds to the spectrum of a compressed exotic scalar or pseudoscalar spectrum that leads to interesting collider signatures which are difficult to probe in the inert Higgs doublet model (IHDM) with current and near-future data
We focus on the mono-Higgs channel in the diphoton final state at both the HL option of the Large Hadron Collider (LHC) at 14 TeV and the Future Circular Collider (FCC-hh) at 100 TeV
Summary
The observation of neutrino oscillations in solar, atmospheric, reactor, and accelerator experiments remains one clear indication that the Standard Model (SM) is not a complete framework of fundamental physics. In contrast to the λ5 term in the potential, there is another coupling between Φ and the SM Higgs, λ4, which has a nonvanishing β function even if the coupling is chosen to be zero at some very high energy scale This region of parameter space corresponds to the spectrum of a compressed exotic scalar or pseudoscalar spectrum that leads to interesting collider signatures which are difficult to probe in the IHDM with current and near-future data. In the fermionic DM case, the CP-odd and CP-even scalars decay predominantly into the SM neutrino and the Majorana fermion Ni, and they cannot be seen at colliders; i.e., they behave as dark scalars In other words, both the IHDM and the scotogenic model provide identical signatures at colliders but with different event yields since they have different parameter space.
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