Two-Loop Electron Factor Contribution to Lamb Shift in Muonium and Positronium

Abstract

We calculate hard spin-independent contributions to energy levels in muonium and positronium which are due to radiatively corrected electron factor insertion in two-photon exchange diagrams. Calculation of these corrections is motivated by the new round of precise measurements of spin-independent transition frequencies in muonium and positronium.

arXiv comment7 pages, 3 figures

References in corpus (8)

• Theory of Light Hydrogenlike Atoms
• Precision physics of simple atoms: QED tests, nuclear structure and fundamental constants
• The Mu-MASS (MuoniuM lAser SpectroScopy) experiment
• Radiative-Recoil Corrections of Order $\alpha (Z\alpha {)}^5(m/M)m$ to Lamb Shift Revisited
• Light-by-Light Scattering Nonlogarithmic Corrections to Hyperfine Splitting in Muonium
• Update of Muonium 1S-2S transition frequency
• Measurement of the $2S_{1/2},F$=$0\to 2P_{1/2},F$=$1$ transition in Muonium
• Muonium Lamb shift: theory update and experimental prospects

Cited by in corpus (1)

• Measurement of the ${\text{1}}^{\text{3}}{\text{S}}_{\text{1}}\to {\text{2}}^{\text{3}}{\text{S}}_{\text{1}}$ interval in positronium using field-ionization of Rydberg states