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

TL;DR

This paper reviews recent numerical methods for estimating the Hadronic Light-by-Light contribution to the muon g-2, suggesting a revised higher value supported by lattice QCD results.

Contribution

It proposes an updated Standard Model prediction for the muon g-2 by incorporating recent axial-vector meson and short-distance constraint analyses.

Findings

Revised muon g-2 contribution: (102±17)×10^{-11}

Support from recent lattice QCD evaluations

Advocates for updating the Standard Model prediction

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 $(102\pm17)\times10^{-11}$, accounting for a revised contribution from axial-vector mesons and short-distance constraints. This $\sim10\%$ larger result seems to be supported by the most recent lattice QCD evaluations.