Abstract
The fourth-order radiative correction to the slope at of the Dirac form factor of the free-electron vertex is calculated using computer techniques. The result, disagrees with previous calculations, and implies a new theoretical value for the order contribution to the Lamb shift. The new values for the separation in H and D are increased by (0.35 ± 0.07) MHz and are in good agreement with the results of recent experiments.
- Received 5 January 1970
DOI:https://doi.org/10.1103/PhysRevLett.24.562
©1970 American Physical Society