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Conference Paper

A Test of Charge-Parity-Time Invariance at the Atto-Electronvolt Scale


Blaum,  Klaus
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Mooser, A., Higuchi, T., Smorra, C., Nagahama, H., Leefer, N., Schneider, G., et al. (2017). A Test of Charge-Parity-Time Invariance at the Atto-Electronvolt Scale. JPS conference proceedings, 18: 011019.

Cite as: https://hdl.handle.net/21.11116/0000-0000-622E-F
We developed a novel fast measurement procedure for cyclotron frequency comparisons of two individual particles in a Penning trap, which enabled us to compare the charge-to-mass ratio of the proton and the antiproton with a fractional precision of 69 parts per trillion. To date this is the most precise test of charge-parity-time invariance using baryons. Our measurements were performed at cyclotron frequencies of about 30 MHz, which means that charge-parity-time symmetry holds at the atto-electronvolt scale.