Understanding the MiniBooNE and the muon and electron $g-2$ anomalies with a light $Z'$ and a second Higgs doublet

Understand

Two of the most widely studied extensions of the Standard Model (SM) are $a)$ the addition of a new $U(1)$ symmetry to its existing gauge groups, and $b)$ the expansion of its scalar sector to incorporate a second Higgs doublet.

• We show that when combined, they allow us to understand the electron-like event excess seen in the MiniBooNE (MB) experiment as well as account for the observed anomalous values of the muon magnetic moment.
• A light $Z'$ associated with an additional $U(1)$ coupled to baryons and to the dark sector, with flavor non-universal couplings to leptons, in conjunction with a second Higgs doublet is capable of explaining the MB excess.
• The $Z'$ obtains its mass from a dark singlet scalar, which mixes with the two Higgs doublets.