One more hard three-loop correction to parapositronium energy levels

One more hard three-loop correction to parapositronium energy levels

A hard three-loop correction to parapositronium energy levels of order mα7 is calculated. This nonlogarithmic contribution is due to the insertions of one-loop photon propagator in the fermion lines in the diagrams with virtual two-photon annihilation. We obtained ΔE=0.03297(2)(mα7/π3) for this ener...

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Veröffentlicht in:Physical review. D 2017-07, Vol.96 (1), Article 011301
Hauptverfasser: Eides, Michael I., Shelyuto, Valery A.
Format: Artikel
Sprache:eng
Schlagworte:
Energy levels
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Zusammenfassung:A hard three-loop correction to parapositronium energy levels of order mα7 is calculated. This nonlogarithmic contribution is due to the insertions of one-loop photon propagator in the fermion lines in the diagrams with virtual two-photon annihilation. We obtained ΔE=0.03297(2)(mα7/π3) for this energy shift.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.96.011301