TY - JOUR
T1 - New precise spectroscopy of the hyperfine structure in muonium with a high-intensity pulsed muon beam
AU - Kanda, S.
AU - Fukao, Y.
AU - Ikedo, Y.
AU - Ishida, K.
AU - Iwasaki, M.
AU - Kawall, D.
AU - Kawamura, N.
AU - Kojima, K. M.
AU - Kurosawa, N.
AU - Matsuda, Y.
AU - Mibe, T.
AU - Miyake, Y.
AU - Nishimura, S.
AU - Saito, N.
AU - Sato, Y.
AU - Seo, S.
AU - Shimomura, K.
AU - Strasser, P.
AU - Tanaka, K. S.
AU - Tanaka, T.
AU - Torii, H. A.
AU - Toyoda, A.
AU - Ueno, Y.
N1 - Funding Information:
The authors thank the J-PARC and KEK personnel for scientific, engineering, and technical supports to prepare and accomplish the experiment. This experiment was conducted under the user program 2017A0134 at MLF of J-PARC. This work was supported by Japanese JSPS KAKENHI Grant Numbers 23244046, 26247046, 14J11374, 15K17666, 15H05742 and 17H01133.
Publisher Copyright:
© 2021 The Author(s)
PY - 2021/4/10
Y1 - 2021/4/10
N2 - 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 νHFS=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.
AB - 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 νHFS=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.
KW - High-intensity pulsed beam
KW - Hyperfine structure (HFS)
KW - Muon
KW - Muonium
KW - Quantum electrodynamics (QED)
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U2 - 10.1016/j.physletb.2021.136154
DO - 10.1016/j.physletb.2021.136154
M3 - Article
AN - SCOPUS:85101692035
VL - 815
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
M1 - 136154
ER -