Supersymmetric minimal $U(1)_X$ model at the TeV scale with right-handed Majorana neutrino dark matter

Abstract

We propose a supersymmetric extension of the minimal $U(1)_X$ model, along with a new $Z_2$-parity. One of the salient features of this model relates to how both the $U(1)_X$ gauge symmetry and R-parity are broken radiatively at the TeV scale by the VEV of a $Z_2$-even right handed neutrino. By assigning one right-handed neutrino $Z_2$-odd parity, it can remain a viable dark matter (DM) candidate, despite R-parity being broken. Furthermore, the DM relic abundance receives an enhanced annihilation cross section due to the $U(1)_X$ gauge boson ($Z'$) resonance and is in agreement with the current observations. We have also found a complementarity that exists between the observed DM relic abundance and search results for the $Z^\prime$ boson resonance at the Large Hadron Collider (LHC), which further constrains the parameter space of our $U(1)_X$ model. Lastly, we consider a $SU(5)\times U(1)_x$ GUT extension and investigate the complementarities mentioned previously.