Measurement of the 1s-2s energy interval in muonium

V.Meyer (1); S.N.Bagayev (5); P.E.G.Baird (2); P.Bakule (2),; M.G.Boshier (4); A. Breitrueck (1); S.L.Cornish (2); S. Dychkov (5),; G.H.Eaton (3); A. Grossmann (1); D.Huebl (1); V.W.Hughes (6); K.Jungmann (1),; I.C.Lane (2); Y.W.Liu (2); D.Lucas (2); Y.Matyugin (5); J.Merkel (1); G. zu; Putlitz (1); I.Reinhard (1); P.G.H.Sandars (2); R.Santra (1); P.Schmidt (1),; C.A.Scott (3); W.T.Toner (2); M.Towrie (3); K.Traeger (1); L.Willmann (1),; V.Yakhontov (1) ((1)U.Heidelberg; (2)U.Oxford; (3)RAL,; (4)U.Sussex,(5)I.LaserPhys.Novosibirsk; (6)Yale U)

arXiv:hep-ex/9907013·hep-ex·August 31, 2016

Measurement of the 1s-2s energy interval in muonium

V.Meyer (1), S.N.Bagayev (5), P.E.G.Baird (2), P.Bakule (2),, M.G.Boshier (4), A. Breitrueck (1), S.L.Cornish (2), S. Dychkov (5),, G.H.Eaton (3), A. Grossmann (1), D.Huebl (1), V.W.Hughes (6), K.Jungmann (1),, I.C.Lane (2), Y.W.Liu (2), D.Lucas (2), Y.Matyugin (5), J.Merkel (1)

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TL;DR

This paper reports a precise measurement of the muonium 1s-2s energy interval using Doppler-free two-photon laser spectroscopy, confirming quantum electrodynamics predictions and refining fundamental particle ratios.

Contribution

The study provides the most accurate measurement of the muonium 1s-2s interval and derives the muon-electron mass ratio with high precision.

Findings

01

Measured the 1s-2s interval as 2,455,528,941.0(9.8) MHz

02

Determined the muon-electron mass ratio as 206.76838(17)

03

Estimated the muon-electron charge ratio as -1 with a small uncertainty

Abstract

The 1s-2s interval has been measured in the muonium ({ $μ^{+} e^{-}$ }) atom by Doppler-free two-photon laser spectroscopy. The frequency separation of the states was determined to be 2 455 528 941.0(9.8) MHz in good agreement with quantum electrodynamics. The muon-electron mass ratio can be extracted and is found to be 206.768 38(17). The result may be interpreted as measurement of the muon-electron charge ratio as $- 1 - 1.1 (2.1) \cdot 1 0^{- 9}$ .

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