Low Scale $U(1)_X$ Gauge Symmetry as an Origin of Dark Matter, Neutrino Mass and Flavour Anomalies

Understand

We study a generic leptophilic $U(1)_X$ extension of the standard model with a light gauge boson.

• The $U(1)_X$ charge assignments for the leptons are guided by lepton universality violating (LUV) observables in semileptonic $b \to s\ell\ell$ decays, muon anomalous magnetic moment and the origin of leptonic masses and mixing.
• Anomaly cancellation conditions require the addition of new chiral fermions in the model, one of which acts as a dark matter (DM) candidate when it is stabilised by an additional $\mathcal{Z}_2$ symmetry.
• From our analysis, we show two different possible models with similar particle content that lead to quite contrasting neutrino mass origin and other phenomenology.