Hard three-loop corrections to hyperfine splitting in positronium and muonium

Michael I. Eides, Valery A. Shelyuto

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

We consider hard three-loop corrections to hyperfine splitting in muonium and positronium generated by the diagrams with closed electron loops. There are six gauge-invariant sets of such diagrams that generate corrections of order mα7. The contributions of these diagrams are calculated for an arbitrary electron-muon mass ratio without expansion in the small mass ratio. We obtain the formulas for contributions to hyperfine splitting that in the case of a small mass ratio describe corrections for muonium and in the case of equal masses describe corrections for positronium. The first few terms of the expansion of hard corrections in the small mass ratio were earlier calculated for muonium analytically. We check numerically that the new results coincide with the sum of the known terms of the expansion in the case of a small mass ratio. In the case of equal masses we obtain hard nonlogarithmic corrections of order mα7 to hyperfine splitting in positronium.

Original languageEnglish
Article number013010
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume92
Issue number1
DOIs
StatePublished - Jul 17 2015

Bibliographical note

Publisher Copyright:
© 2015 American Physical Society.

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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