Hyperfine splitting in positronium to ${\cal O}(\alpha^7m_e)$: one-photon annihilation contribution
2014
We present the complete result for the ${\cal O}(\alpha^7m_e)$ one-photon annihilation contribution to the hyperfine splitting of the ground state energy levels in positronium. Numerically it increases the prediction of quantum electrodynamics by $217\pm 1$ kHz.
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