One-particle measurement of the antiproton magnetic moment

J. Disciacca*, M. Marshall, K. Marable, G. Gabrielse, S. Ettenauer, E. Tardiff, R. Kalra, D. W. Fitzakerley, M. C. George, E. A. Hessels, C. H. Storry, M. Weel, D. Grzonka, W. Oelert, T. Sefzick

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

70 Scopus citations


For the first time a single trapped antiproton (p̄) is used to measure the p̄ magnetic moment μ. The moment μS/(/2) is given in terms of its spin S and the nuclear magneton (μN) by μ/ μN=-2.792 845±0.000 012. The 4.4 parts per million (ppm) uncertainty is 680 times smaller than previously realized. Comparing to the proton moment measured using the same method and trap electrodes gives μp=-1.000 000±0.000 005 to 5 ppm, for a proton moment μppS/(/2), consistent with the prediction of the CPT theorem. Published by the American Physical Society under the terms of the <uri xlink:href= Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Original languageEnglish (US)
Article number130801
JournalPhysical review letters
Issue number13
StatePublished - Mar 25 2013

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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