New corrections to hyperfine splitting in muonium and hydrogen
Karshenboim S. G. , Shelyuto V. A. , Eides M. I.
Radiative corrections to the hyperflne splitting of relative order a2 (Za), induced by polarization insertions in external photons, are derived. The new contribution is (α2(Ζα)/ττ)( -4/3In2[(l +fi)/2] 20/9л/51п[(1 + + 608/451n2 + (тг79) (38)/15π+ 91639/37800)in units of the energy of the Fermi hyperflne splitting, Ef,