|Title||Progress towards an improved comparison of the proton-to-antiproton charge-to-mass ratios|
|Publication Type||Journal Article|
|Year of Publication||2018|
|Authors||Higuchi, T, Harrington, JA, Borchert, MJ, Blessing, PE, Devlin, JA, Morgner, J, Sellner, S, Smorra, C, Bohman, MA, Mooser, AH, Schneider, GL, Schön, N, Wiesinger, M, Blaum, K, Matsuda, Y, Ospelkaus, C, Quint, W, Walz, J, Yamazaki, Y, Ulmer, S|
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.