2019•Proceedings of The 39th International Conference on High Energy Physics — PoS(ICHEP2018)Open access
New Precision Measurement of Muonium Hyperfine Structure
Y. Ueno, Y. Matsuda, S. Seo, Toya Tanaka, Hiroyuki A. Torii, D. Yagi, Hiromasa Yasuda, S. Nishimura, K. Sasaki, Y. Sato, K. Shimomura, P. Strasser, Hiroshi Yamaguchi, S. Kanda, Kazuo Tanaka, Takashi Yamanaka
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Abstract
Muonium is one of the best probes for the test of the bound-state QED, owing to the absence of the effect from the internal structure of nucleons. The recent establishment of intense pulsed muon beams at Japan Proton Accelerator Research Complex (J-PARC) paves the way to improved measurement of the muonium ground-state hyperfine structure (MuHFS). The measurement of MuHFS also determines the muon magnetic moment precisely, which is an important input parameter for the measurements of muon g-2, which is known for the 3-sigma discrepancy between the experiment and the theory. Muonium Spectroscopy Experiment Using Microwave (MuSEUM) collaboration aims to improve the precursor MuHFS experiment by a factor of ten. We present the status of the project and the prospect.
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