High-precision comparison of the antiproton-to-proton charge-to-mass ratio

S. Ulmer (), C. Smorra, A. Mooser, K. Franke, H. Nagahama, G. Schneider, T. Higuchi, S. Van Gorp, K. Blaum, Y. Matsuda, W. Quint, J. Walz and Y. Yamazaki
Additional contact information
S. Ulmer: RIKEN, Ulmer Initiative Research Unit
C. Smorra: RIKEN, Ulmer Initiative Research Unit
A. Mooser: RIKEN, Ulmer Initiative Research Unit
K. Franke: RIKEN, Ulmer Initiative Research Unit
H. Nagahama: RIKEN, Ulmer Initiative Research Unit
G. Schneider: RIKEN, Ulmer Initiative Research Unit
T. Higuchi: RIKEN, Ulmer Initiative Research Unit
S. Van Gorp: RIKEN, Atomic Physics Laboratory, Wako
K. Blaum: Max-Planck-Institut für Kernphysik
Y. Matsuda: Graduate School of Arts and Sciences, University of Tokyo
W. Quint: GSI—Helmholtzzentrum für Schwerionenforschung
J. Walz: Institut für Physik, Johannes Gutenberg-Universität
Y. Yamazaki: RIKEN, Atomic Physics Laboratory, Wako

Nature, 2015, vol. 524, issue 7564, 196-199

Abstract: The CPT theorem (the assumption that physical laws are invariant under simultaneous charge conjugation, parity transformation and time reversal) is central to the standard model of particle physics; here the charge-to-mass ratio of the antiproton is compared to that of the proton, with a precision of 69 parts per trillion, and the result supports the CPT theorem at the atto-electronvolt scale.

Date: 2015
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DOI: 10.1038/nature14861

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