Precision measurement of the Lamb shift in Muonium

Abstract

We report a new measurement of the $n=2$ Lamb shift in Muonium using microwave spectroscopy. Our result of $1047.2(2.3{)}_{\text{stat}}(1.1{)}_{\text{syst}}$ MHz comprises an order of magnitude improvement upon the previous best measurement. This value matches the theoretical calculation within one standard deviation allowing us to set limits on CPT violation in the muonic sector, as well as on new physics coupled to muons and electrons which could provide an explanation of the muon $g-2$ anomaly.

arXiv comment6 pages, 4 figures

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• Science Case for the new High-Intensity Muon Beams HIMB at PSI
• Searching for ultralight scalar dark matter with muonium and muonic atoms
• Towards an independent determination of muon g-2 from muonium spectroscopy
• 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
• Pre-Born-Oppenheimer Dirac-Coulomb-Breit computations for two-body systems
• GRASIAN: Towards the first demonstration of gravitational quantum states of atoms with a cryogenic hydrogen beam
• Room-temperature emission of muonium from aerogel and zeolite targets
• Functional Epistemology "Nullifies" Dyson's Rebuttal of Perturbation Theory