The Baryon Antibaryon Symmetry Experiment (BASE-CERN) at CERN’s antiproton decelerator facility is aiming at high-precision comparisons of the fundamental properties of protons and antiprotons, such as charge-to-mass ratios, magnetic moments and lifetimes. Such experiments provide sensitive tests of the fundamental charge-parity-time invariance in the baryon sector.
BASE was approved in 2013 and has measured since then, utilizing single-particle multi-Penning-trap techniques, the antiproton-to-proton charge-to-mass ratio with a fractional precision of 69 p.p.t. , as well as the antiproton magnetic moment with fractional precisions of 0.8 p.p.m. and 1.5 p.p.b., respectively . At our matter companion experiment BASE-Mainz, we have performed proton magnetic moment measurements with fractional uncertainties of 3.3 p.p.b.  and 0.3 p.p.b. . By combining the data of both experiments we provide a baryon-magnetic-moment based CPT test
gpbar/gp = 1.000 000 000 2(15),
which improves the uncertainty of previous experiments by more than a factor of 3000 . A unique antiproton reservoir trap used in BASE, furthermore allows us to set constraints on directly measured antiproton lifetime. Our current value tp>10.2a improves previous best limits by a factor of 30 .
In this talk I will review the achievements of BASE and will give an outlook on our future physics program.
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M. Pepe-Altarelli, G. Unal.......... Refreshments will be served at 10h30