One More Hard Three-Loop Correction to Parapositronium Energy Levels
High Energy Physics - Phenomenology
2017-07-19 v2 Atomic Physics
Abstract
A hard three-loop correction to parapositronium energy levels of order 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 for this energy shift.
Cite
@article{arxiv.1705.09166,
title = {One More Hard Three-Loop Correction to Parapositronium Energy Levels},
author = {Michael I. Eides and Valery A. Shelyuto},
journal= {arXiv preprint arXiv:1705.09166},
year = {2017}
}
Comments
Version to be published in Phys. Rev.D, results unchanged