arXiv:2302.00492·v1·High Energy Physics — Experiment
Testing CPT Invariance by High-Precision Comparisons of Fundamental Properties of Protons and Antiprotons at BASE
E. J. Wursten🇯🇵 · M. J. Borchert🇯🇵 · J. A. Devlin🇯🇵 · S. R. Erlewein🇯🇵 · M. Fleck🇯🇵 · J. A. Harrington🇯🇵 · J. I. Jäger🇨🇭 · B. M. Latacz🇯🇵 · P. Micke🇯🇵 · G. Umbrazunas🇯🇵 · F. Abbass🇩🇪 · M. Bohman🇯🇵
Abstract
The BASE collaboration at the Antiproton Decelerator facility of CERN compares the fundamental properties of protons and antiprotons using advanced Penning-trap systems. In previous measurement campaigns, we measured the magnetic moments of the proton and the antiproton, reaching (sub-)parts-in-a-billion fractional uncertainty. In the latest campaign, we have compared the proton and antiproton charge-to-mass ratios with a fractional uncertainty of 16 parts in a trillion. In this contribution, we give an overview of the measurement campaign, and detail how its results are used to constrain nine spin-independent coefficients of the Standard-Model Extension in the proton and electron sector.
Comments: Presented at the Ninth Meeting on CPT and Lorentz Symmetry, Bloomington, Indiana, May 17-26, 2022