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Precision measurement of the Lamb shift in Muonium

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arxiv 2108.12891 v2 pith:PPFZIH2L submitted 2021-08-29 physics.atom-ph hep-ex

B. Ohayon , G. Janka , I. Cortinovis , Z. Burkley , L. de Sousa Bourges , E. Depero , A. Golovizin , X. Ni
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Z. Salman A. Suter C. Vigo T. Prokscha P. Crivelli
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classification physics.atom-phhep-ex
keywords measurementlambmuoniumshifttextrmallowinganomalybest
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abstract

We report a new measurement of the $n=2$ Lamb shift in Muonium using microwave spectroscopy. Our result of $1047.2(2.3)_\textrm{stat}(1.1)_\textrm{syst}$ 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.

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

    physics.atom-ph 2026-07 conditional novelty 7.0 of 10

    The muon-line radiative-recoil correction to the muonium Lamb shift at order α^6(m/M)^2 m is found to be π² times the common prefactor, replacing a previously quoted (139/32−2 ln2) coefficient.

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