New calculation of the three-photon-annihilation contribution to the positronium hyperfine interval
- 1 June 1988
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 37 (11) , 4071-4078
- https://doi.org/10.1103/physreva.37.4071
Abstract
The three-photon-annihilation contribution to the positronium hyperfine interval is obtained in analytic form. This contribution is of order m, and has the value -0.969 MHz. The result of a previous calculation of this contribution is shown to be incomplete because of a subtlety in the regularization of infrared divergences.
Keywords
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