Measurement of the Positive Muon Anomalous Magnetic Moment to 0.46 ppm
2021 · paper · Physics
Reports a new measurement of the positive muon's anomalous magnetic moment, with a precision of 0.46 parts per million.
Checked: PDF from arxiv.org, fetched 4 Oct 2026. Page numbers are those of that PDF.
2 findings
Reference or label Reference [50], cited for the magnetic field determination, is printed with the title of reference [48]: "Measurement of the anomalous precession frequency of the muon in the Fermilab Muon g−2 experiment, Phys. Rev. A 103, 042208".
- p. 9 Reference [50]
Measurement of the anomalous precession frequency of the muon in the Fermilab Muon g−2 experiment, Phys. Rev. A 103, 042208
- p. 9 Reference [48]
Measurement of the anomalous precession frequency of the muon in the Fermilab Muon g−2 experiment, Phys. Rev. D 103, 072002 (2021)
- p. 3 Introduction, last sentence
the beam dynamics corrections [49], and the magnetic field [50] determination
- p. 3 Introduction, last paragraph
the magnetic field [50] determination
Judge's note: Page 9 image shows [48] and [50] with word-for-word identical titles but different author lists and journals (Phys. Rev. D 103, 072002 and Phys. Rev. A 103, 042208). The text cites [48] for the muon precession and [50] for the magnetic field (page 3, and pages 5 and 6 for the NMR probes and field transients). The defect is established from the paper itself: the title of [50] was copied from [48]. The correct title of the field paper is not in the files and has to come from the authors or the journal record.
Second check: another model agreed
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Reference or label Reference [64] has placeholder volume and page: "J. Magn. Reson XYZ, xyx (2021)."
- p. 10 Reference [64]
J. Magn. Reson XYZ, xyx (2021)
- p. 10 Reference [64]
J. Magn. Reson XYZ, xyx (2021).
Only the authors can say what is right here.
Judge's note: Page 10 image shows a bold "XYZ" as the volume and "xyx" as the page, a leftover template placeholder, so the entry cannot be located. Entry [49] shows the list's own form for unpublished work, "(to be published)". Also in the same entry: "Reson" lacks its full stop and "hilbert-transform" is lower-case. The real volume and article number have to come from the authors.
Second check: another model agreed
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9 minor (typos and the like; most checked by the judge only)
Typo Affiliation 28 prints "Institut für Kern - und Teilchenphysik" with a space before the suspended hyphen; it should read "Kern- und Teilchenphysik".
- p. 2 Affiliation 28
Institut für Kern - und Teilchenphysik
Judge's note: Page 2 image shows a clear word space on both sides of the hyphen in affiliation 28. German suspended-hyphen usage attaches the hyphen to "Kern". Cosmetic.
Second check: none (judge only)
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Typo The text after Eq. 4 reads "We deconstruct ω̃′p(T) into the absolute NMR calibration procedure", with a bare T where Eqs. 2 and 3 write ω̃′p(Tr).
- p. 4 Paragraph after Eq. 4
We deconstruct ω̃′p(T) into the absolute NMR calibration procedure
- p. 3 Eq. 3
ω̃′p(Tr)
- p. 4 Paragraph after Eq. 4
We deconstruct ˜ω′p(T) into the absolute NMR calibration procedure
- p. 3 Eq. 3
˜ω′p(Tr)
Judge's note: The crop of page 4 shows "(T)" with no subscript. The crop of page 3 shows Tr = 34.7°C defined and ω̃′p(Tr) in Eqs. 2 and 3. No bare T is defined anywhere in the text. The meaning is clear, so this is a notation slip.
Second check: none (judge only)
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Typo Table II row label reads "μ′p(34.7°)/μe", giving the temperature without its unit; elsewhere it is "34.7°C".
- p. 7 Table II, row label
μ′p(34.7°)/μe
- p. 3 Experimental Method, reference temperature
Tr = 34.7◦C
Judge's note: The Table II crop shows "(34.7°)" with no C. Page 3 shows "Tr = 34.7°C", and the abstract and note [67] also give °C. Cosmetic; the meaning is clear.
Second check: none (judge only)
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Typo "The combined experimental (Exp) average[68] is" has no space before the citation bracket.
- p. 7 Computing aµ and Conclusions, sentence before the aµ(Exp) equation
average[68] is
Judge's note: Page 7 image shows "average[68]" set solid, while "systematic [67]" a few lines above has a space, as do the other citations.
Second check: none (judge only)
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Typo Reference [2] prints the first author as "D. E. Nagel, R. S. Julian, and J. R. Zacharias"; the surname is believed to be "Nagle".
- p. 8 Reference [2]
D. E. Nagel, R. S. Julian, and J. R. Zacharias
Only the authors can say what is right here.
Judge's note: Rests on outside knowledge: that the first author of Phys. Rev. 72, 971 (1947) is D. E. Nagle. The crop confirms the page prints "Nagel". The correct spelling cannot be checked from the files.
Second check: none (judge only) · checked by hand
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Typo Reference [1] gives the title as "The Quantum theory of electron. Part II"; the published title is believed to be "The Quantum Theory of the Electron. Part II".
- p. 8 Reference [1]
The Quantum theory of electron. Part II
Only the authors can say what is right here.
Judge's note: Rests on outside knowledge: the original title of Dirac's 1928 paper in Proc. Roy. Soc. Lond. A118, 351. The crop confirms the printed wording, with "the" missing before "electron" and mixed capitalisation. Probably inherited from a bibliographic database.
Second check: none (judge only)
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Typo Reference [42] lists "G. Charpak, F. J. M. Farley, and R. L. Garwin, A New Measurement of the Anomalous Magnetic Moment of the Muon, Phys. Lett. 1, 16 (1962)." as a complete author list, but the paper is believed to have six authors.
- p. 9 Reference [42]
G. Charpak, F. J. M. Farley, and R. L. Garwin, A New Measurement
- p. 9 Reference list, entry [42]
G. Charpak, F. J. M. Farley, and R. L. Garwin, A New Measurement of the Anomalous Magnetic Moment of the Muon, Phys. Lett. 1, 16 (1962).
Only the authors can say what is right here.
Judge's note: Rests on outside knowledge: that Phys. Lett. 1, 16 (1962) is by Charpak, Farley, Garwin, Muller, Sens and Zichichi. Page 9 image confirms the entry ends with "and R. L. Garwin" and no "et al.", while the neighbouring truncated entries [43] and [44] use "et al.". The full author list cannot be checked from the files.
Second check: none (judge only)
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Typo Reference [78] title is garbled: "Leading hadronic contribution to the muon 2 magnetic moment from lattice QCD", with a stray "2"; the entry also has an empty field before "(2020)".
- p. 10 Reference [78]
Leading hadronic contribution to the muon 2 magnetic moment from lattice QCD
Judge's note: Page 10 image shows a plain "muon 2 magnetic moment", with no "g−" before the 2, followed by ", (2020)," with an empty field. The phrase is garbled on its face. The intended title, believed to be "...the muon magnetic moment from lattice QCD" (arXiv:2002.12347), is outside knowledge, but the defect does not depend on it.
Second check: none (judge only)
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Typo Note [68] has no space between sentences: "correct combined result.There are".
- p. 10 Reference/footnote [68]
combined result.There are
- p. 10 Footnote [68]
correct combined result.There are
Judge's note: Page 10 image shows "result.There" set without a space in note [68]. Not an extraction artefact.
Second check: none (judge only)