Contributions to the muon’s anomalous magnetic moment from a hidden sector

The measurement of the anomalous magnetic moment of the muon provides a stringent test of the standard model and of any physics that lies beyond it. There is currently a deviation of 3.1σ between the standard model prediction for the muon’s anomalous magnetic moment and its experimental value. We calculate the contribution to the anomalous magnetic moment in theories where the muon couples to a particle in a hidden sector (that is, uncharged under the standard model) and a connector (which has nontrivial standard model gauge and hidden sector quantum numbers).

Research highlights► Described scenario involving hidden and connector particles that couple to the standard model which could be relevant for dark matter. ► Examined constraints on such particles in the case that the SM particle they couple to is the muon. ► Found regions of couplings which could explain the discrepancy in the muon’s anomalous magnetic moment which differ for different hidden and connector particles’ spins.