Contributions to the hyperfine splitting and Lamb shift intervals of order α2(Zα)5 induced by two-loop insertions in the electron line are considered. It is shown that this gauge invariant set of diagrams contains nineteen topologically different graphs. The contributions both to the hyperfine splitting and the Lamb shift induced by graphs containing the one-loop electron self-energy as a subgraph and also by the graph containing two one-loop vertices are obtained.
|Number of pages||9|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|State||Published - Aug 12 1993|
Bibliographical noteFunding Information:
This paper was completed during the visit of one of the authors (M.E.) to the Penn State University. M.E. is deeply grateful to his colleagues at Penn State and especially to Prof H. Grotch for their kind hospitality. This work was supported by the Russian Foundation for Fundamental Research under grant #93-02-3853. The work by S.G.K. was also supported by a Soros Foundation grant awarded by the American Physical Society.
ASJC Scopus subject areas
- Nuclear and High Energy Physics