2023•arXiv (Cornell University)Open access
Two-Loop Electron Factor Contribution to Lamb Shift in Muonium and Positronium
Michael I. Eides, Valery A. Shelyuto
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Abstract
We calculate hard spin-independent contributions to energy levels in muonium and positronium which are due to radiatively corrected electron factor insertion in two-photon exchange diagrams. Calculation of these corrections is motivated by the new round of precise measurements of spin-independent transition frequencies in muonium and positronium.
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