Two-loop QED corrections with closed fermion loops

Details Two-loop QED corrections with closed fermion loops Two-loop QED corrections with closed fermion loops

2008-03-30

arxiv.org/abs/0803.4305v2

Phys. Rev. A 77, 062510 (2008)

Physics

Atomic Physics

Analysis of the finite nuclear size effect is extended in the revised version. 12 pages, 5 figures, 4 tables

Scientific paper

10.1103/PhysRevA.77.062510

We report a calculation of all two-loop QED corrections with closed fermion loops for the n=1 and n=2 states of H-like ions and for a wide range of the nuclear charge numbers Z=1-100. The calculation is performed to all orders in the binding-strength parameter (Z \alpha), with the exception that in a few cases the free-loop approximation is employed in the treatment of the fermion loops. Detailed comparison is made with previous (Z \alpha)-expansion calculations and the higher-order remainder term to order \alpha^2 (Z \alpha)^6 is identified.

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