Measurement of the transition frequency from 2S1/2, F = 0 to 2P1/2, F = 1 states in Muonium

Gianluca Janka, Ben Ohayon, Irene Cortinovis, Zak Burkley, Lucas Sousa Borges, Emilio Depero, Artem Golovizin, Xiaojie Ni, Zaher Salman, Andreas Suter, Thomas Prokscha and Paolo Crivelli ()
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Gianluca Janka: ETH Zürich
Ben Ohayon: ETH Zürich
Irene Cortinovis: ETH Zürich
Zak Burkley: ETH Zürich
Lucas Sousa Borges: ETH Zürich
Emilio Depero: ETH Zürich
Artem Golovizin: ETH Zürich
Xiaojie Ni: Paul Scherrer Institute
Zaher Salman: Paul Scherrer Institute
Andreas Suter: Paul Scherrer Institute
Thomas Prokscha: Paul Scherrer Institute
Paolo Crivelli: ETH Zürich

Nature Communications, 2022, vol. 13, issue 1, 1-6

Abstract: Abstract Muons are puzzling physicists since their discovery when they were first thought to be the meson predicted by Yukawa to mediate the strong force. The recent result at Fermilab on the muon g-2 anomaly puts the muonic sector once more under the spotlight and calls for further measurements with this particle. Here, we present the results of the measurement of the 2S1/2, F = 0 → 2P1/2, F = 1 transition in Muonium. The measured value of 580.6(6.8) MHz is in agreement with the theoretical calculations. A value of the Lamb shift of 1045.5(6.8) MHz is extracted, compatible with previous experiments. We also determine the 2S hyperfine splitting in Muonium to be 559.6(7.2) MHz. The measured transition being isolated from the other hyperfine levels holds the promise to provide an improved determination of the Muonium Lamb shift at a level where bound state QED recoil corrections not accessible in hydrogen could be tested. This result would be sensitive to new physics in the muonic sector, e.g., to new bosons which might provide an explanation of the g-2 muon anomaly and allow to test Lorentz and CPT violation. We also present the observation of Muonium in the n = 3 excited state opening up the possibility of additional precise microwave measurements.

Date: 2022
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DOI: 10.1038/s41467-022-34672-0

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