We use a variation of the Bethe-Salpeter equation to complete the calculation of the one-photon annihilation contribution to the hyperfine interval of positronium at order mα⁶. Our results are in accord with a quite different calculation independently done using an effective field theory approach. This completes the evaluation of all the mα⁶ terms. We give the total theoretical value for this interval and compare with experiment.
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Adkins et al. (2002) studied this question.
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