Hadronic Light-by-Light Scattering in the Muonium Hyperfine Splitting

S. G. Karshenboim, V. A. Shelyuto, A. I. Vainshtein

We consider an impact of hadronic light-by-light scattering on the muonium hyperfine structure. A shift of the hyperfine interval $\Delta \nu (\mathrm{Mu}{)}_{\mathrm{HLBL}}$ is calculated with…