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

Michael I. Eides; Valery A. Shelyuto

doi:10.1103/x9bs-x8lk

Letter

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

Michael I. Eides ^*

Valery A. Shelyuto ^†

Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, USA

D. I. Mendeleyev Institute for Metrology, St. Petersburg 190005, Russia

^*Contact author: meides@g.uky.edu
^†Contact author: shelyuto@vniim.ru

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Phys. Rev. D 114, L031302 – Published 28 August, 2026

DOI: https://doi.org/10.1103/x9bs-x8lk

Abstract

We calculate radiative-recoil contribution of order $Z^{2} α (Z α)^{5} (m / M)^{2} m$ 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 $1 S - 2 S$ and $2 S - 2 P$ experiments currently in progress.

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Physical Review D

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

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

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