One More Analytic Result for $α^{2}(Zα)^{5}m$ Correction to the Lamb Shift

Abstract

The analytic result for the radiative correction of order $α^{2}(Zα)^{5}m$ to the Lamb shift connected with a polarization insertion in one of the two external Coulomb lines is obtained. This correction arises from a gauge invariant set of diagrams which contain, besides the polarization insertion in the Coulomb leg, all one-loop radiative photon insertions in the electron line with two external Coulomb lines.