One more radiative-recoil correction to the Lamb shift in muonium

Abstract

We calculate radiative-recoil contribution of order $Z^2\alpha (Z\alpha {)}^5(m/M{)}^{2}m$ to the Lamb shift in muonium. This correction is due to insertion of radiative photons in the heavy line in the two-photon exchange diagrams. Our calculations are inspired by a new round of precise $1S-2S$ and $2S-2P$ experiments currently in progress.

9 pages, 3 figures; v2: published version