Details on the O(me α6) Positronium Hyperfine Splitting due to Single Photon Annihilation
Abstract
A detailed presentation is given of the analytic calculation of the single-photon annihilation contributions to the positronium ground state hyperfine splitting to order meα6 in the framework of non-relativistic effective theories. The current status of the theoretical description of the positronium ground state hyperfine splitting is reviewed.
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