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Precision measurements of muonium and muonic helium hyperfine structure at J-PARC.

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Title: Precision measurements of muonium and muonic helium hyperfine structure at J-PARC.
Authors: Strasser, Patrick1,2,3 (AUTHOR) patrick.strasser@kek.jp, Abe, Mitsushi4 (AUTHOR), Asai, Kanta5 (AUTHOR), Fukumura, Seiso6 (AUTHOR), Fushihara, Mahiro5 (AUTHOR), Goto, Yu5 (AUTHOR), Ino, Takashi1,2 (AUTHOR), Iwai, Ryoto7 (AUTHOR), Kanda, Sohtaro1,2,3 (AUTHOR), Kawamura, Shiori5 (AUTHOR), Kitaguchi, Masaaki1,5,8 (AUTHOR), Nishimura, Shoichiro1,2 (AUTHOR), Oku, Takayuki9,10 (AUTHOR), Okudaira, Takuya5,9 (AUTHOR), Powell, Adam11 (AUTHOR), Sasaki, Ken-ichi4 (AUTHOR), Shimizu, Hirohiko M.1,5 (AUTHOR), Shimomura, Koichiro1,2,3 (AUTHOR), Tada, Hiroki5 (AUTHOR), Torii, Hiroyuki A.12 (AUTHOR)
Source: European Physical Journal D (EPJ D). Mar2025, Vol. 79 Issue 3, p1-15. 15p.
Subjects: Hyperfine structure, Quantum electrodynamics, Helium isotopes, Calibration, Standard model (Nuclear physics), Magnetic moments, Muons
Abstract: At the J-PARC Muon Science Facility (MUSE), the MuSEUM collaboration is now performing new precision measurements of the ground state hyperfine structure (HFS) of both muonium and muonic helium atoms. High-precision measurements of the muonium ground-state HFS are recognized as one of the most sensitive tools for testing bound-state quantum electrodynamics theory to precisely probe the standard model and determine fundamental constants of the positive muon magnetic moment and mass. The same technique can also be employed to measure muonic helium HFS, obtain the negative muon magnetic moment and mass, and test and improve the theory of the three-body atomic system. Measurements at zero magnetic field have already yielded more accurate results than previous experiments for both muonium and muonic helium atoms. High-field measurements are now ready to start collecting data using the world's most intense pulsed muon beam at the MUSE H-line. We aim to improve the precision of previous measurements ten times for muonium and a hundred times or more for muonic helium. We review all the key developments for these new measurements, focusing on the high-field experiment, and report the latest results and prospects. [ABSTRACT FROM AUTHOR]
Copyright of European Physical Journal D (EPJ D) is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Precision measurements of muonium and muonic helium hyperfine structure at J-PARC.
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  Data: <searchLink fieldCode="AR" term="%22Strasser%2C+Patrick%22">Strasser, Patrick</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)<i> patrick.strasser@kek.jp</i><br /><searchLink fieldCode="AR" term="%22Abe%2C+Mitsushi%22">Abe, Mitsushi</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Asai%2C+Kanta%22">Asai, Kanta</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Fukumura%2C+Seiso%22">Fukumura, Seiso</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Fushihara%2C+Mahiro%22">Fushihara, Mahiro</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Goto%2C+Yu%22">Goto, Yu</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ino%2C+Takashi%22">Ino, Takashi</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Iwai%2C+Ryoto%22">Iwai, Ryoto</searchLink><relatesTo>7</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kanda%2C+Sohtaro%22">Kanda, Sohtaro</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kawamura%2C+Shiori%22">Kawamura, Shiori</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kitaguchi%2C+Masaaki%22">Kitaguchi, Masaaki</searchLink><relatesTo>1,5,8</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Nishimura%2C+Shoichiro%22">Nishimura, Shoichiro</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Oku%2C+Takayuki%22">Oku, Takayuki</searchLink><relatesTo>9,10</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Okudaira%2C+Takuya%22">Okudaira, Takuya</searchLink><relatesTo>5,9</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Powell%2C+Adam%22">Powell, Adam</searchLink><relatesTo>11</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sasaki%2C+Ken-ichi%22">Sasaki, Ken-ichi</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Shimizu%2C+Hirohiko+M%2E%22">Shimizu, Hirohiko M.</searchLink><relatesTo>1,5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Shimomura%2C+Koichiro%22">Shimomura, Koichiro</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tada%2C+Hiroki%22">Tada, Hiroki</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Torii%2C+Hiroyuki+A%2E%22">Torii, Hiroyuki A.</searchLink><relatesTo>12</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22European+Physical+Journal+D+%28EPJ+D%29%22">European Physical Journal D (EPJ D)</searchLink>. Mar2025, Vol. 79 Issue 3, p1-15. 15p.
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  Data: <searchLink fieldCode="DE" term="%22Hyperfine+structure%22">Hyperfine structure</searchLink><br /><searchLink fieldCode="DE" term="%22Quantum+electrodynamics%22">Quantum electrodynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Helium+isotopes%22">Helium isotopes</searchLink><br /><searchLink fieldCode="DE" term="%22Calibration%22">Calibration</searchLink><br /><searchLink fieldCode="DE" term="%22Standard+model+%28Nuclear+physics%29%22">Standard model (Nuclear physics)</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+moments%22">Magnetic moments</searchLink><br /><searchLink fieldCode="DE" term="%22Muons%22">Muons</searchLink>
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  Data: At the J-PARC Muon Science Facility (MUSE), the MuSEUM collaboration is now performing new precision measurements of the ground state hyperfine structure (HFS) of both muonium and muonic helium atoms. High-precision measurements of the muonium ground-state HFS are recognized as one of the most sensitive tools for testing bound-state quantum electrodynamics theory to precisely probe the standard model and determine fundamental constants of the positive muon magnetic moment and mass. The same technique can also be employed to measure muonic helium HFS, obtain the negative muon magnetic moment and mass, and test and improve the theory of the three-body atomic system. Measurements at zero magnetic field have already yielded more accurate results than previous experiments for both muonium and muonic helium atoms. High-field measurements are now ready to start collecting data using the world's most intense pulsed muon beam at the MUSE H-line. We aim to improve the precision of previous measurements ten times for muonium and a hundred times or more for muonic helium. We review all the key developments for these new measurements, focusing on the high-field experiment, and report the latest results and prospects. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of European Physical Journal D (EPJ D) is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1140/epjd/s10053-025-00959-2
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        Text: English
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      – SubjectFull: Helium isotopes
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