The charm-quark contribution to light-by-light scattering in the muon from lattice QCD.

We compute the hadronic light-by-light scattering contribution to the muon from the charm quark using lattice QCD. The calculation is performed on ensembles generated with dynamical (, , ) quarks at the SU(3) symmetric point with degenerate pion and kaon masses of around 415 MeV. It includes the connected charm contribution, as well as the leading disconnected Wick contraction, involving the correlation between a charm and a light-quark loop.