Publication Date

2021

Journal or Book Title

Physics Letters B

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(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. (c) 2021 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

ISSN

0370-2693

ORCID

Nishimura, Shoichiro/0000-0002-5581-4090; Kawamura, Naritoshi/0000-0002-3099-5526; Kanda, Sohtaro/0000-0002-9080-4154; Tanaka, Kazuo/0000-0001-6916-9654

DOI

https://doi.org/10.1016/j.physletb.2021.136154

Volume

815

License

UMass Amherst Open Access Policy

Creative Commons License

Creative Commons Attribution 4.0 License
This work is licensed under a Creative Commons Attribution 4.0 License.

Funder

MLF of J-PARC [2017A0134]; Japanese JSPS KAKENHI [23244046, 26247046, 14J11374, 15K17666, 15H05742, 17H01133]

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