Hyperfine splitting in positronium to ${\cal O}(α^7m_e)$ : one-photon annihilation contribution

preprint2014arXivOpen access

We present the complete result for the ${\cal O}(α^7m_e)$ 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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Hyperfine splitting in positronium to ${\cal O}(α^7m_e)$ : one-photon annihilation contribution

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Hyperfine splitting in positronium to O(α7me){\cal O}(α^7m_e)O(α7me​): one-photon annihilation contribution

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Hyperfine splitting in positronium to ${\cal O}(α^7m_e)$ : one-photon annihilation contribution