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Sixfold improved single particle measurement of the magnetic moment of the antiproton

Author

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  • H. Nagahama

    (RIKEN, Ulmer Initiative Research Unit, 2-1 Hirosawa
    Graduate School of Arts and Sciences, University of Tokyo)

  • C. Smorra

    (RIKEN, Ulmer Initiative Research Unit, 2-1 Hirosawa
    CERN)

  • S. Sellner

    (RIKEN, Ulmer Initiative Research Unit, 2-1 Hirosawa)

  • J. Harrington

    (Max-Planck-Institut für Kernphysik)

  • T. Higuchi

    (RIKEN, Ulmer Initiative Research Unit, 2-1 Hirosawa
    Graduate School of Arts and Sciences, University of Tokyo)

  • M. J. Borchert

    (Institut für Quantenoptik, Leibniz Universität Hannover)

  • T. Tanaka

    (RIKEN, Ulmer Initiative Research Unit, 2-1 Hirosawa
    Graduate School of Arts and Sciences, University of Tokyo)

  • M. Besirli

    (RIKEN, Ulmer Initiative Research Unit, 2-1 Hirosawa)

  • A. Mooser

    (RIKEN, Ulmer Initiative Research Unit, 2-1 Hirosawa)

  • G. Schneider

    (RIKEN, Ulmer Initiative Research Unit, 2-1 Hirosawa
    Institut für Physik, Johannes Gutenberg-Universität)

  • K. Blaum

    (Max-Planck-Institut für Kernphysik)

  • Y. Matsuda

    (Graduate School of Arts and Sciences, University of Tokyo)

  • C. Ospelkaus

    (Institut für Quantenoptik, Leibniz Universität Hannover
    Physikalisch-Technische Bundesanstalt, QUEST)

  • W. Quint

    (GSI-Helmholtzzentrum für Schwerionenforschung GmbH)

  • J. Walz

    (Institut für Physik, Johannes Gutenberg-Universität
    Helmholtz-Institut Mainz, sektion MAM)

  • Y. Yamazaki

    (RIKEN, Atomic Physics Research Unit)

  • S. Ulmer

    (RIKEN, Ulmer Initiative Research Unit, 2-1 Hirosawa)

Abstract

Our current understanding of the Universe comes, among others, from particle physics and cosmology. In particle physics an almost perfect symmetry between matter and antimatter exists. On cosmological scales, however, a striking matter/antimatter imbalance is observed. This contradiction inspires comparisons of the fundamental properties of particles and antiparticles with high precision. Here we report on a measurement of the g-factor of the antiproton with a fractional precision of 0.8 parts per million at 95% confidence level. Our value /2=2.7928465(23) outperforms the previous best measurement by a factor of 6. The result is consistent with our proton g-factor measurement gp/2=2.792847350(9), and therefore agrees with the fundamental charge, parity, time (CPT) invariance of the Standard Model of particle physics. Additionally, our result improves coefficients of the standard model extension which discusses the sensitivity of experiments with respect to CPT violation by up to a factor of 20.

Suggested Citation

  • H. Nagahama & C. Smorra & S. Sellner & J. Harrington & T. Higuchi & M. J. Borchert & T. Tanaka & M. Besirli & A. Mooser & G. Schneider & K. Blaum & Y. Matsuda & C. Ospelkaus & W. Quint & J. Walz & Y. , 2017. "Sixfold improved single particle measurement of the magnetic moment of the antiproton," Nature Communications, Nature, vol. 8(1), pages 1-7, April.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms14084
    DOI: 10.1038/ncomms14084
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