Speaker
Description
The anomalous magnetic moments of the muon and the electron, 𝑎μ and 𝑎ₑ, are precision benchmarks of the Standard Model and promising New-Physics probes. The hadronic vacuum polarization (HVP) contribution remains the dominant source of uncertainty, a problem compounded by the current tension between data-driven (dispersive) and lattice QCD evaluations. I will discuss the status of the HVP contribution, contrasting the two approaches and highlighting recent progress in understanding isospin-breaking effects. The subleading hadronic light-by-light (HLbL) contribution still leaves considerable room for improvement. Looking further ahead, the electron 𝑔−2, once the fine-structure constant αₑₘ is known with greater precision, may provide an additional stringent constraint on hadronic contributions. These developments chart the path toward reducing theoretical uncertainties to the level of the completed Fermilab measurement of the muon 𝑔−2.
