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

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. Yamazaki and S. Ulmer ()
Additional contact information
H. Nagahama: RIKEN, Ulmer Initiative Research Unit, 2-1 Hirosawa
C. Smorra: RIKEN, Ulmer Initiative Research Unit, 2-1 Hirosawa
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
M. J. Borchert: Institut für Quantenoptik, Leibniz Universität Hannover
T. Tanaka: RIKEN, Ulmer Initiative Research Unit, 2-1 Hirosawa
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
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
W. Quint: GSI-Helmholtzzentrum für Schwerionenforschung GmbH
J. Walz: Institut für Physik, Johannes Gutenberg-Universität
Y. Yamazaki: RIKEN, Atomic Physics Research Unit
S. Ulmer: RIKEN, Ulmer Initiative Research Unit, 2-1 Hirosawa

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: 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.

Date: 2017
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DOI: 10.1038/ncomms14084

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