EPJ Web Conf.
Volume 198, 2019Quantum Technology International Conference 2018 (QTech 2018)
|Number of page(s)||8|
|Published online||15 January 2019|
New precise measurements of muonium hyperfine structure at J-PARC MUSE
High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
2 Department of Physics, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
3 Department of Physics, Seoul National University, Seoul 151-742, South Korea
4 Graduate School of Arts and Sciences, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
5 Ibaraki University, College of Science, 2-1-1 Bunkyo, Mito 310-8512, Japan
6 RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
7 Department of Physics, Kyushu University, 744 Motooka, Nishi, Fukuoka, Fukuoka 819-0395, Japan
8 Advanced Science Research Center, Japan Atomic Energy Agency (JAEA), 2-4 Shirane Shirakata, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan
9 Physics Department, University of Massachusetts Amherst, Amherst, MA, USA
10 Department of Physics, Nagoya University, Nagoya 464-8602, Japan
11 TRIUMF, Vancouver, BC V6T 2A3, Canada
12 International Christian University (ICU), 3-10-2 Osawa, Mitaka, Tokyo 181-8585, Japan
13 Cyclotron and Radioisotope Center (CYRIC), Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8578, Japan
14 RIKEN, Cluster for Pioneering Research, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
15 Research Center for Nuclear Physics (RCNP), Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
16 Radioisotope Laboratory, Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
17 Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi 400-8511, Japan
* Corresponding author: patrick.strasser(at)kek.jp
Published online: 15 January 2019
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.
© The Authors, published by EDP Sciences, 2019
This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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