Sixfold improved single particle measurement of the magnetic moment of the antiproton. Nagahama, H., Smorra, C., Sellner, S., Harrington, J., Higuchi, T., Borchert, M., J., Tanaka, T., Besirli, M., Mooser, A., Schneider, G., Blaum, K., Matsuda, Y., Ospelkaus, C., Quint, W., Walz, J., Yamazaki, Y., & Ulmer, S. Nature Communications, 8:14084, Nature Publishing Group, 1, 2017.
Sixfold improved single particle measurement of the magnetic moment of the antiproton [pdf]Paper  Sixfold improved single particle measurement of the magnetic moment of the antiproton [link]Website  abstract   bibtex   
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 g " p /2 ¼ 2.7928465(23) outperforms the previous best measurement by a factor of 6. The result is consistent with our proton g-factor measurement g p /2 ¼ 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.
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 title = {Sixfold improved single particle measurement of the magnetic moment of the antiproton},
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 year = {2017},
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 keywords = {Atomic and molecular physics,Theoretical physics},
 pages = {14084},
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 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 g " p /2 ¼ 2.7928465(23) outperforms the previous best measurement by a factor of 6. The result is consistent with our proton g-factor measurement g p /2 ¼ 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.},
 bibtype = {article},
 author = {Nagahama, H. and Smorra, C. and Sellner, S. and Harrington, J. and Higuchi, T. and Borchert, M. J. and Tanaka, T. and Besirli, M. and Mooser, A. and Schneider, G. and Blaum, K. and Matsuda, Y. and Ospelkaus, C. and Quint, W. and Walz, J. and Yamazaki, Y. and Ulmer, S.},
 journal = {Nature Communications}
}
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