Hard spin-independent three-loop radiative contributions to energy levels in positronium generated by the two-photon-exchange diagrams with one-loop radiative insertions in the fermion lines and exchanged photons are calculated. This is a next step in calculations of all corrections of order mα7 inspired by the new generation of precise 1S−2S and 2S−2P measurements in positronium.
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|State||Published - Sep 10 2022|
Bibliographical noteFunding Information:
This work was supported by the NSF grants PHY-1724638 and PHY-2011161 .
© 2022 The Authors
ASJC Scopus subject areas
- Nuclear and High Energy Physics