New precise measurement of muonium hyperfine structure interval at J-PARC
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New precise measurement of muonium hyperfine structure interval at J-PARC Y. Ueno1 · M. Aoki2 · Y. Fukao3 · Y. Higashi1 · T. Higuchi1 · H. Iinuma3 · Y. Ikedo3 · K. Ishida4 · T. U. Ito5 · M. Iwasaki4 · R. Kadono3 · O. Kamigaito4 · S. Kanda6 · D. Kawall7 · N. Kawamura3 · A. Koda3 · K. M. Kojima3 · M. K. Kubo8 · Y. Matsuda1 · T. Mibe3 · Y. Miyake3 · T. Mizutani1 · K. Nagamine3 · K. Nishiyama3 · T. Ogitsu3 · R. Okubo3 · N. Saito3 · K. Sasaki3 · K. Shimomura3,9 · P. Strasser3 · M. Sugano3 · M. Tajima1 · K. S. Tanaka1,4 · D. Tomono10 · H. A. Torii1 · E. Torikai11 · A. Toyoda3 · K. Ueno3 · A. Yamamoto3 · M. Yoshida3
© Springer International Publishing Switzerland 2017
Abstract MuSEUM is an international collaboration aiming at a new precise measurement of the muonium hyperfine structure at J-PARC (Japan Proton Accelerator Research Complex). Utilizing its intense pulsed muon beam, we expect a ten-fold improvement for both measurements at high magnetic field and zero magnetic field. We have developed a sophisticated monitoring system, including a beam profile monitor to measure the 3D distribution of muonium atoms to suppress the systematic uncertainty. This article is part of the Topical Collection on Proceedings of the 6th International Symposium on Symmetries in Subatomic Physics (SSP 2015), Victoria, Canada, 8-12 June 2015 Edited by Michael Gericke and Gerald Gwinner Y. Ueno
[email protected] 1
Graduate School of Arts and Sciences, University of Tokyo, 3-8-1 Komaba, Meguro Ward, Tokyo, Japan
2
Graduate School of Science, Osaka University, Toyonaka, Osaka, Japan
3
KEK, 1-1 Oho, Tsukuba, Ibaraki, Japan
4
RIKEN, Wako, Saitama, Japan
5
Japan Atomic Energy Agency, Tokai, Naka, Ibaraki, Japan
6
Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo Ward, Tokyo, Japan
7
Department of Physics, University of Massachusetts, Amherst, Amherst, MA, USA
8
Graduate School of Arts and Science, International Christian University, Mitaka, Tokyo, Japan
14
Hyperfine Interact (2017) 238:14
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Keywords Muonium · Spectroscopy · Bound-state QED
1 Introduction 1.1 Overview of the experiment Muonium is the bound state of a positive muon and an electron. Since muonium is free from the finite-size effect of nucleon, the theoretical value of the muonium hyperfine structure (MuHFS) can be precisely calculated at a level of 56 ppb [1], which is roughly ten times better than that of hydrogen. MuSEUM (Muonium Spectroscopy Experiment Using Microwave) is an international collaboration working on a new MuHFS measurement, exploiting the intense pulsed muon beam available at J-PARC (Japan Proton Accelerator Research Complex). Until now, two methods have been used to measure MuHFS: One at zero magnetic field, and the other in a high magnetic field utilizing the Zeeman splitting. The last MuHFS measurement at zero field was performed 41 years ago [2], and the one at high field was published 17 years ago [3]. Both experiments were conducted at LAMPF (Los Alamos Meson Physics Facility). The experimental v
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