Extra Higgs boson and $Z^{\prime }$ as portals to signatures of heavy neutrinos at the LHC

In this paper, we discuss the potential of observing heavy neutrino (${\nu }_h$) signatures of a $U(1{)}_{B-L}$ enlarged Standard Model (SM) encompassing three heavy Majorana neutrinos alongside the known light neutrino states at the Large Hadron Collider (LHC). We exploit the theoretical decay via a heavy (non-SM-like) Higgs boson and $Z^{\prime }$ production followed by ${\nu }_h\to l^{\pm }{W}^{\mp (\ast )}$ and ${\nu }_h\to {\nu }_l{Z}^{(\ast )}$ decays, ultimately yielding a $3l+2j+E_T^{miss}$ signature and, depending upon how boosted the final state objects are, we define different possible selections aimed at improving the signal to background ratio in LHC Run 2 data for a wide range of heavy neutrino masses.