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2-Higgs Doublet Models (2HDMs) typically need to invoke an ad-hoc discretesymmetry to avoid severe flavor bounds and in addition feature masslessneutrinos, thus falling short of naturally complying with existing data.However, when augmented by an Abelian gauge symmetry naturally incorporatingneutrino masses via a type-I seesaw mechanism while at the same time escapingflavor changing interactions, such enlarged 2HDMs become very attractivephenomenologically. In such frameworks, the distinctive element is the $Z'$gauge boson generated by the spontaneous breaking of the Abelian group$U(1)_X$. In this work, we derive updated collider bounds on it. Severaltheoretical setups are possible, each with different and sometimes suppressedcouplings to quarks and leptons. Thus, complementary data from dijet anddilepton resonance searches need to be considered to fully probe these objects.We employ the corresponding datasets as obtained at the Large Hadron Collider(LHC) at the 13 TeV CMs energy for $\mathcal{L}=12,36$ and $300$ fb$^{-1}$ ofluminosity. Moreover, we present the potential sensitivity to such $Z'$s of theHigh Luminosity LHC (HL-LHC) and High Energy LHC (HE-LHC).

Collider Bounds on 2-Higgs Doublet Models with $U(1)_X$ Gauge Symmetries