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The contribution of hadronic scattering of light-by-light to the hyperfinestructure of muonium is calculated using experimental data on the transitionform factors of two photons into a hadron. The amplitudes of interactionbetween a muon and an electron with horizontal and vertical exchange areconstructed. The contributions due to the exchange of pseudoscalar, axialvector, scalar and tensor mesons are taken into account.

Contribution of hadronic light-by-light scattering to the hyperfine structure of muonium