Positronium energy levels at order m α⁷: vacuum polarization corrections in the two-photon-annihilation channel
classification
✦ hep-ph
keywords
alphacorrectionsenergylevelsorderpolarizationpositroniumvacuum
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We have calculated all contributions to the energy levels of parapositronium at order $m \alpha^7$ coming from vacuum polarization corrections to processes involving virtual annihilation to two photons. This work is motivated by ongoing efforts to improve the experimental determination of the positronium ground-state hyperfine splitting.
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