Update of Muonium 1S-2S transition frequency

Abstract

We present an updated value of the Muonium 1S-2S transition frequency, highlighting contributions from different QED corrections as well as the large uncertainty in the Dirac contribution, stemming from the uncertainty of the electron-to-muon mass ratio. Improving the measurement of this spectral line would allow to extract a more accurate determination of fundamental constants, such as the electron-to-muon mass ratio or, combined with the Muonium hyperfine splitting, an independent value of the Rydberg constant. Furthermore we report on the current status of the Mu-MASS experiment, which aims at measuring the Muonium 1S-2S transition frequency at a 10 kHz uncertainty level.

6 pages, 1 figure, prepared for PSAS22 proceedings

References in corpus (5)

• Laboratory tests of Lorentz and CPT symmetry with muons
• The Lamb shift of the $1s$ state in hydrogen: two-loop and three-loop contributions
• Stable High Power deep-UV Enhancement Cavity in Ultra High Vacuum with Fluoride Coatings
• Recoil corrections to the energy levels of hydrogenic atoms
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Cited by in corpus (2)

• Two-Loop Electron Factor Contribution to Lamb Shift in Muonium and Positronium
• Pulsed CW laser for long-term spectroscopic measurements at high power in deep-UV