We consider hard three-loop nonlogarithmic corrections of order mα7 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)mα7/π3=-5.672kHz.
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|State||Published - Jun 30 2014|
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)