Light $Z^{\prime }$ and Dark Matter from U(1)${}_X$ Gauge Symmetry

Abstract

We consider a U(1)${}_X$ gauge symmetry extension of the Standard Model (SM) with a $Z^{\prime }$-portal Majorana fermion dark matter that allows for a relatively light gauge boson $Z^{\prime }$ with mass of 10 MeV$-$ a few GeV and a much heavier dark matter through the freeze-in mechanism. In a second scenario the roles are reversed, and the dark matter mass, in the keV range or so, lies well below the $Z^{\prime }$ mass, say, $\sim 1$ GeV. We outline the parameter space that can be explored for these two scenarios at the future Lifetime Frontier experiments including Belle-II, FASER, LDMX and SHiP.

arXiv comment18 pages, 4 figures, new references added, typos corrected

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