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In this study we explore the LHC's Run II potential to the discovery of heavyMajorana neutrinos, with luminosities between $30$ and $3000$ fb$^{-1}$ in the$l^{\pm}l^{\pm}j~j$ final state. Given that there exist many models forneutrino mass generation, even within the Type I seesaw framework, we use asimplified model approach and study two simple extensions to the StandardModel, one with a single heavy Majorana neutrino, singlet under the StandardModel gauge group, and a limiting case of the left-right symmetric model. Wethen extend the analysis to a future hadron collider running at $100$ TeVcenter of mass energies. This extrapolation in energy allows us to study therelative importance of the resonant production versus gauge boson fusionprocesses in the study of Majorana neutrinos at hadron colliders. We analyzeand propose different search strategies designed to maximize the discoverypotential in either the resonant production or the gauge boson fusion modes.

Search for Heavy Right-Handed Neutrinos at the LHC and Beyond in the Same-Sign Same-Flavor Leptons Final State