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.
Categories: hep-ph