Nonrelativistic QED approach to the Lamb shift

被引:94
作者
Jentschura, UD
Czarnecki, A
Pachucki, K
机构
[1] Max Planck Inst Kernphys, D-69117 Heidelberg, Germany
[2] Univ Alberta, Dept Phys, Edmonton, AB T6G 2J1, Canada
[3] Univ Warsaw, Inst Theoret Phys, PL-00681 Warsaw, Poland
来源
PHYSICAL REVIEW A | 2005年 / 72卷 / 06期
关键词
D O I
10.1103/PhysRevA.72.062102
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We calculate the one- and two-loop corrections of order alpha(Z alpha)(6) and alpha(2)(Z alpha)(6), respectively, to the Lamb shift in hydrogenlike systems using the formalism of nonrelativistic quantum electrodynamics. We obtain general results valid for all hydrogenic states with nonvanishing orbital angular momentum and for the normalized difference of S states. These results involve the expectation value of local effective operators and relativistic corrections to Bethe logarithms. The one-loop correction is in agreement with previous calculations for the particular cases of S, P, and D states. The two-loop correction in the order alpha(2)(Z alpha)(6) includes the pure two-loop self-energy and all diagrams with closed fermion loops. The obtained results allow one to obtain improved theoretical predictions for all excited hydrogenic states.
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页数:20
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