New muonium HFS measurements at J-PARC/MUSE

Strasser, P.; Aoki, M.; Fukao, Y.; Higashi, Youichirou; Higuchi, Takashi; Iinuma, H.; Ikedo, Yutaka; Ishida, K.; Ito, Takashi U.; Iwasaki, M.; Kadono, R.; Kamigaito, O.; Kanda, S.; Kawall, D.; Kawamura, N.; Koda, A.; Kojima, Kenji; Kubo, K.; Matsuda, Y.; Matsudate, Y.; Mibe, T.; Miyake, Yasuhiro; Mizutani, T.; Nagamine, K.; Nishimura, S.; Nishiyama, K.; Ogitsu, T.; Okubo, R.; Saito, N.; Sasaki, Κ.; Seo, S. H.; Shimomura, K.; Sugano, M.; Tajima, M.; Tanaka, Kazuo; Tanaka, T.; Tomono, D.; Torii, H. A.; Torikai, E.; Toyoda, A.; Ueno, K.; Ueno, Yuichiro; Yagi, D.; Yamamoto, A.; Yoshida, Makoto

doi:10.1007/s10751-016-1331-4

Cited by 7 publications

(2 citation statements)

References 5 publications

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“…with an aim to reduce the uncertainty in Eq. (3.17) by an order of magnitude [77]. The theoretical prediction, Δν SM Mu , as given by CODATA 2014 [78], 9 is Although the HFS of muonium is mainly QED dominated, it receives higher-order contributions from the EW and hadronic sectors.…”

Section: δν Expmentioning

confidence: 95%

g−2 of charged leptons, α(MZ2) , and the hyperfine splitting of muonium

2020

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Following updates in the compilation of e þ e − → hadrons data, this work presents reevaluations of the hadronic vacuum polarization contributions to the anomalous magnetic moments of the electron (a e), muon (a μ) and tau lepton (a τ), to the ground-state hyperfine splitting of muonium and also updates the hadronic contributions to the running of the QED coupling at the mass scale of the Z boson, αðM 2 Z Þ. Combining the results for the hadronic vacuum polarization contributions with recent updates for the hadronic light-bylight corrections, the electromagnetic and the weak contributions, the deviation between the measured value of a μ and its Standard Model prediction amounts to Δa μ ¼ ð28.02 AE 7.37Þ × 10 −10 , corresponding to a muon g − 2 discrepancy of 3.8σ.

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Section: δν Expmentioning

confidence: 95%

g−2 of charged leptons, α(MZ2) , and the hyperfine splitting of muonium

2020

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“…Mu-MASS aims to measure the 1S-2S transition frequency of muonium to an unprecedented precision of 10 kHz (4 ppt level). The combined results of the ongoing hyperfine splitting measurement (MUSEUM) at the Japan Proton Accelerator Research Complex (JPARC) [35] with the anticipated Mu-MASS results will provide one of the most sensitive test of bound state QED with a relative precision of 1 × 10 −9 [36].…”

Section: The Mu-mass Experimentsmentioning

confidence: 99%

The Mu-MASS (muonium laser spectroscopy) experiment

Crivelli

2018

Hyperfine Interact

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We present a new experiment, Mu-MASS, aiming for a 1000-fold improvement in the determination of the 1S-2S transition frequency of Muonium (M), the positive-muon/electron bound state. This substantial improvement beyond the current state-of-the-art relies on the novel cryogenic M converters and confinement techniques we developed, on the new excitation and detection schemes which we implemented for positronium spectroscopy and the tremendous advances in generation of UV radiation. This experiment is planned to be performed at the Paul Scherrer Institute (PSI). Interesting anomalies in the muon sector have accumulated: notably the famous anomalous muon magnetic moment (g-2) and the muonic hydrogen Lamb shift measurement which prompted the so-called proton charge radius puzzle. These tantalizing results triggered vibrant activity on both experimental and theoretical sides. Different explanations have been put forward including exciting solutions invoking New Physics beyond the Standard Model. Mu-MASS could contribute to clarifying the origin of these anomalies by providing robust and reliable values of fundamental constants such as the muon mass and a value of the Rydberg constant independent of finite size effects.

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New precise measurements of muonium hyperfine structure at J-PARC MUSE

et al. 2019

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High precision measurements of the ground state hyperfine structure (HFS) of muonium is a stringent tool for testing bound-state quantum electrodynamics (QED) theory, determining fundamental constants of the muon magnetic moment and mass, and searches for new physics. Muonium is the most suitable system to test QED because both theoretical and experimental values can be precisely determined. Previous measurements were performed decades ago at LAMPF with uncertainties mostly dominated by statistical errors. At the J-PARC Muon Science Facility (MUSE), the MuSEUM collaboration is planning complementary measurements of muonium HFS both at zero and high magnetic field. The new high-intensity muon beam that will soon be available at H-Line will provide an opportunity to improve the precision of these measurements by one order of magnitude. An overview of the different aspects of these new muonium HFS measurements, the current status of the preparation for high-field measurements, and the latest results at zero field are presented.

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New muonium HFS measurements at J-PARC/MUSE

Cited by 7 publications

References 5 publications

g−2 of charged leptons, α(MZ2) , and the hyperfine splitting of muonium

g−2 of charged leptons, α(MZ2) , and the hyperfine splitting of muonium

The Mu-MASS (muonium laser spectroscopy) experiment

New precise measurements of muonium hyperfine structure at J-PARC MUSE

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