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RESEARCH PRODUCT
Axionlike Particles, Lepton-Flavor Violation, and a New Explanation of aμ and ae
Marvin SchnubelSophie RennerAndrea ThammMartin BauerMatthias NeubertMatthias Neubertsubject
CouplingPhysicsParticle physicsMuonPhotonHigh Energy Physics::PhenomenologyGeneral Physics and AstronomyElectronElectron magnetic dipole momentPhysics::GeophysicsOrders of magnitude (time)Radiative transferHigh Energy Physics::ExperimentLeptondescription
Axionlike particles (ALPs) with lepton-flavor-violating couplings can be probed in exotic muon and tau decays. The sensitivity of different experiments depends strongly on the ALP mass and its couplings to leptons and photons. For ALPs that can be resonantly produced, the sensitivity of three-body decays such as μ→3e and τ→3μ exceeds by many orders of magnitude that of radiative decays like μ→eγ and τ→μγ. Searches for these two types of processes are therefore highly complementary. We discuss experimental constraints on ALPs with a single dominant lepton-flavor-violating coupling. Allowing for one or more such couplings offers qualitatively new ways to explain the anomalies related to the magnetic moments of the muon or the electron. The explanation of both anomalies requires lepton-flavor-nonuniversal or lepton-flavor-violating ALP couplings.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2020-05-28 | Physical Review Letters |