New precise spectroscopy of the hyperfine structure in muonium with a high-intensity pulsed muon beam

Abstract

A hydrogen-like atom consisting of a positive muon and an electron is known as muonium. It is a near-ideal two-body system for a precision test of bound-state theory and fundamental symmetries. The MuSEUM collaboration performed a new precision measurement of the muonium ground-state hyperfine structure at J-PARC using a high-intensity pulsed muon beam and a high-rate capable positron counter. The resonance of hyperfine transition was successfully observed at a near-zero magnetic field, and the muonium hyperfine structure interval of ${\nu }_{\text{HFS}}$ = 4.463302(4) GHz was obtained with a relative precision of 0.9 ppm. The result was consistent with the previous ones obtained at Los Alamos National Laboratory and the current theoretical calculation. We present a demonstration of the microwave spectroscopy of muonium for future experiments to achieve the highest precision.

arXiv comment7 pages, 8 figures

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• Muon $g-2$: A review
• Precision measurement of the Lamb shift in Muonium
• Rabi-Oscillation Spectroscopy of the Hyperfine Structure of Muonium Atoms
• 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
• Precision calculation of the recoil--finite-size correction for the hyperfine splitting in muonic and electronic hydrogen
• Three-Loop Corrections to Lamb Shift in Muonium and Positronium
• Improved Measurements of Muonic Helium Ground-State Hyperfine Structure at a Near-Zero Magnetic Field
• Precision measurements of muonium and muonic helium hyperfine structure at J-PARC
• Room-temperature emission of muonium from aerogel and zeolite targets
• MuMuPy: A Dimuonium-Matter Interaction Calculator