On the Charm Contribution to the Muon $g-2$ Light-by-Light

TL;DR

This paper provides a precise analytic calculation of the charm-quark contribution to the muon g-2 light-by-light scattering, reducing uncertainties and aligning well with lattice results.

Contribution

It introduces a perturbative approach including NLO corrections for the charm contribution in the muon g-2 light-by-light scattering.

Findings

Charm contribution estimated as 3.65(25)×10^{-11}.

Reduced renormalization-scale dependence.

Agreement with lattice calculations.

Abstract

We combine existing perturbative results to show that a precise analytic determination of the charm-quark contribution to the hadronic light-by-light (HLbL) part of the muon anomalous magnetic moment is possible. Working in the $\overline{\mathrm{MS}}$ scheme, we include the NLO $\mathcal{O}(\alpha_s)$ correction, which significantly reduces the residual renormalization-scale dependence and the perturbative uncertainty. Our final result is $a_{\mu}^{\mathrm{HLbLc}}=3.65(25)\times 10^{-11}$, in good agreement with recent lattice determinations.