Abstract
The contribution of the light-by-light diagram to the factor of an electron and muon bound in a Coulomb field is obtained. For an electron in a ground state, our results are in good agreement with the results of other authors obtained numerically for large . For relatively small our results have essentially higher accuracy as compared to the previous ones. For muonic atoms, the contribution is obtained with a high accuracy in the whole region of .
- Received 2 December 2004
DOI:https://doi.org/10.1103/PhysRevA.71.052501
©2005 American Physical Society