Data-driven approximations to the Hadronic Light-by-Light scattering contribution to the muon (g-2)

Abstract

We review recent progress on the numerical determination of the Hadronic Light-by-Light contribution to the anomalous magnetic moment of the muon. We advocate for a slight increase of the White Paper number for its Standard Model prediction, to $(102\pm 17)\times 10^{-11}$, accounting for a revised contribution from axial-vector mesons and short-distance constraints. This $\sim 10\%$ larger result seems to be supported by the most recent lattice QCD evaluations.

Comments: 5 pages + references. Accepted for publication in the proceedings of the HADRON 2023 Conference, Genova, Italy, 5-9 June 2023