Speaker
Description
The muon g-2 is an interesting observable, since it can be measured with great precision and can be computed with excellent accuracy within the Standard Model (SM). The current experimental measurement of muon g-2 shows a deviation to the SM prediction, which may be a hint of new physics. A light particle, scalar or vector, can be nature new physics candidates to explain the current muon g-2 result. If it is a light scalar with a mass around 1 MeV. It can be connected to the origin of neutrino masses and simultaneously survive current bounds on relativistic degrees of freedom in the early universe. If it is a light scalar with mass around pion mass and a coupling to muons of the order of the Standard Model Higgs coupling, it can be tested in the KOTO experiment. If it is a complex scalar with real part around 200 MeV, it can explain muon g-2 and can be tested via electron g-2 experiment. If the light particle for muon g-2 is a dark photon and its mass is time-varying due to environmental effects, for mass around tens of MeV, the muon g–2 solution from the kinetic mixing dark photon becomes viable again. The scenario can be further tested by reanalyzing the existing data with timing information included.
