Progress towards an improved comparison of the proton-to-antiproton charge-to-mass ratios
High-precision comparisons of the proton-to-antiproton charge-to-mass ratios provide sensitive tests of the fundamental charge, parity, time (CPT) invariance. In 2014, we performed such a measurement with a fractional precision of 69parts in a trillion (p.p.t.). In this article, we describe technical developments which were implemented to improve the precision of our previous measurement by at least a factor of 3.
KeywordsAntiproton Proton CPT symmetry Charge-to-mass ratio Penning trap
We acknowledge technical support from the Antiproton Decelerator group, CERN’s cryolab team, and all other CERN groups which provide support to Antiproton Decelerator experiments. We acknowledge financial support from the RIKEN Initiative Research Unit Program, RIKEN President Funding, RIKEN Pioneering Project Funding (EEE), RIKEN FPR Funding, RIKEN chief scientist program, the RIKEN JRA Program, the Max-Planck Society, and the Helmholtz-Gemeinschaft.