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The BASE collaboration at the Antiproton Decelerator facility of CERNcompares the fundamental properties of protons and antiprotons using advancedPenning-trap systems. In previous measurement campaigns, we measured themagnetic moments of the proton and the antiproton, reaching(sub-)parts-in-a-billion fractional uncertainty. In the latest campaign, wehave compared the proton and antiproton charge-to-mass ratios with a fractionaluncertainty of 16 parts in a trillion. In this contribution, we give anoverview of the measurement campaign, and detail how its results are used toconstrain nine spin-independent coefficients of the Standard-Model Extension inthe proton and electron sector.

Testing CPT Invariance by High-Precision Comparisons of Fundamental Properties of Protons and Antiprotons at BASE