Long-lived TeV-scale right-handed neutrino production at the LHC in gauged U(1) model

A gauged U(1)_Xextension of the Standard Model is a simple and consistent framework to naturally incorporate three right-handed neutrinos (RHNs) for generating the observed light neutrino masses and mixing by the type-I seesaw mechanism. We examine the collider testability of the U(1)_Xmodel, both in its minimal form with the conventional charges, as well as with an alternative charge assignment, via the resonant production of the U(1)_X..