One More Hard Three-Loop Correction to Parapositronium Energy Levels

Published 25 May 2017 in hep-ph and physics.atom-ph | (1705.09166v2)

Abstract: A hard three-loop correction to parapositronium energy levels of order $m\alpha^7$ 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 $\Delta E=0.03297(2)(m\alpha^{7/\pi^3)$} for this energy shift.

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