Hard Nonlogarithmic Corrections of Order $mα^7$ to Hyperfine Splitting in Positronium

We consider hard three-loop nonlogarithmic corrections of order $mα^7$ to hyperfine splitting in positronium. All these contributions are generated by the graphs with photon and/or electron loop radiative insertions in the two-photon exchange diagrams. We calculate contributions of six gauge invariant sets of diagrams. The total result for all these diagrams is $ΔE=-1.2917(1)mα^7/π^3=-5.672$ kHz.

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