Radiative-nonrecoil corrections of order alpha^2 (Z alpha)^5 to the Lamb shift

Abstract

We present results for the corrections of order alpha^2 (Z alpha)^5 to the Lamb shift. We compute all the contributing Feynman diagrams in dimensional regularization and a general covariant gauge using a mixture of analytical and numerical methods. We confirm results obtained by other groups and improve their precision. Values of the 32 master integrals for this and similar problems are provided.

Comments: 8 pages, 4 figures; v2: added two references, changed comparison with previous result, conclusions unchanged, matches published version; v3: corrected typo in Table I, final results and conclusions unchanged