Bulletin of the American Physical Society
6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Sunday–Friday, November 26–December 1 2023; Hawaii, the Big Island
Session D14: Minisymposium: Fundamental Symmetries II - Muon, Others
9:00 AM–11:15 AM,
Wednesday, November 29, 2023
Hilton Waikoloa Village
Room: Kohala 4
Chair: Peter Kammel, University of Washington
Abstract: D14.00004 : New Muonic Helium Atom HFS Measurements at J-PARC MUSE
9:45 AM–10:00 AM
Presenter:
Yu Goto
Authors:
Yu Goto
Seiso Fukumura
(School of Science, Nagoya University)
Patrick Strasser
(High Energy Accelerator Research Organization(KEK))
Takashi Ino
(High Energy Accelerator Research Organization(KEK))
Ryoto Iwai
(High Energy Accelerator Research Organization(KEK))
Sohtaro Kanda
(High Energy Accelerator Research Organization(KEK))
Shiori Kawamura
(School of Science, Nagoya University)
Masaaki Kitaguchi
(Kobayashi-Maskawa Institute, Nagoya University)
Shoichiro Nishimura
(High Energy Accelerator Research Organization(KEK))
Takayuki Oku
(Graduate School of Sci.and Eng., Ibaraki University)
Takuya Okudaira
(School of Science, Nagoya University)
Hirohiko M Shimizu
(School of Science, Nagoya University)
Koichiro Shimomura
(High Energy Accelerator Research Organization(KEK))
Hiroki Tada
(School of Science, Nagoya University)
Hiroyuki Torii
(Graduate School of Science, The University of Tokyo)
Collaboration:
MuSEUM collaboration
Muonic helium (μHe) is a hydrogen-like atom composed of a helium atom with one of its
electrons replaced by a negative muon. Its ground-state hyperfine structure (HFS), from the
interaction of the remaining electron and the negative muon magnetic moment, is very similar
to muonium (bound state of a positive muon and an electron). Measurements of the μHe-
HFS interval are a sensitive tool to test the three-body atomic system, bound-state quantum
electrodynamics (QED) theory, and determine fundamental constants of the negative muon
magnetic moment and mass. We can verify the CPT symmetry in muons by comparing these
constants with positive muons.
Precise measurements of the muonium ground-state HFS interval using a microwave
magnetic resonance technique are now in progress at J-PARC by the MuSEUM collaboration.
The same method can be used to precisely determine the μHe-HFS and the negative muon
magnetic moment and mass.
We have successfully measured μHe-HFS at zero field using CH4 as an electron donor at J-
PARC MUSE D-line with better accuracy than previous studies. We are now planning high-
field measurements using the world's most intense pulsed negative muon beam at MUSE
and muon repolarization by SEOP technique. The latest results and future plans will be
outlined.
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