Abstract
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.
| Original language | English |
|---|---|
| Article number | 011301 |
| Journal | Physical Review D |
| Volume | 96 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jul 1 2017 |
Bibliographical note
Publisher Copyright:© 2017 American Physical Society.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)