Hyperfine splitting in positronium to $\mathcal{O}({\alpha }^7{m}_e)$: one-photon annihilation contribution

Abstract

We present the complete result for the $\mathcal{O}({\alpha }^7{m}_e)$ 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.

5 pages, 2 figures

References in corpus (2)

• Ultrasoft contribution to quarkonium production and annihilation
• Three-loop matching of the vector current

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