Three-Loop Corrections to Lamb Shift in Muonium and Positronium
Abstract
We calculate hard spin-independent three-loop radiative corrections to energy levels in muonium and positronium which are due to radiative insertions in two-photon exchange diagrams. These corrections could be relevant for the new generation of precise 1S-2S and 2S-2P measurements in muonium and positronium.
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