Abstract
In the thesis, we study the potential of discovering Majorana neutrino in the mass range from 100 GeV to 10 TeV at the LHC (Run II) and the future FCC-hh/SPPC with luminosities 3 ab−1. The lepton number violating process p p → l± l′± j j will be a significant probe for a Majorana neutrino at the 14/100 TeV proton-proton collider. To illustrate the essential physics, we study a simplified model with mixing between the left-handed and the right- handed neutrinos, also a left-right symmetric model with a TeV level Majorana neutrino. Some strategies and algorithms are proposed to enhance the signal to background ratio for each model. Moreover, the discovery potential for each model at the current and future proton-proton colliders is also discussed.