Seminars and Journal Clubs

Hidden Photons in light of g-2

by Patrick Foldenauer (Durham U.)

Europe/Brussels
Description

Recently, the Muon g-2 collaboration released their first result of the muon anomalous magnetic moment g-2 measured with the E989 experiment at Fermilab. When combined with previous data this result confirms a 4.2 $\sigma$ excess over the Standard Model prediction. In light of this exciting news I want to review the hidden photon landscape in terms of anomaly-free U(1) models and their potential to explain this positive shift in g-2. Of such anomaly-free models only a gauged $U(1)_{L_\mu-L_\tau}$ allows for an explanation of g-2 with a novel MeV-mass hidden photon. Focussing on neutrino interactions, I will present a dedicated strategy of how to combine measurements from muon beam, coherent neutrino-nucleus scattering and direct detection experiments to independently confirm $U(1)_{L_\mu-L_\tau}$ as a solution to g-2 and discriminate it from a simplified muon-coupled $U(1)_{L_\mu}$ mediator.