Abstract
Precision measurements comparing the fundamental properties of conjugate particles and antiparticles constitute stringent tests of CPT invariance. We review recent precision measurements of the BASE collaboration, which improved the uncertainty of the proton and antiproton magnetic moments and the comparison of the proton-to-antiproton charge-to-mass ratio. These measurements constitute the most stringent tests of CPT invariance with antiprotons. Further, we discuss the improved limit on the antiproton lifetime based on the storage of a cloud of antiprotons in the unique BASE reservoir trap. Based on these recent advances, we discuss ongoing technical developments which comprise a coupling trap for the sympathetic cooling of single (anti-)protons with laser-cooled beryllium ions, a transportable trap to relocate antiproton measurements into a high-precision laboratory, and a new experiment to measure the magnetic moment of helium-3 ions, which will improve absolute precision magnetometry.
Highlights
In the development of the Standard Model of particle physics, symmetries have played an important role [1]
We review recent precision measurements of the BASE collaboration, which improved the uncertainty of the proton and antiproton magnetic moments and the comparison of the proton-to-antiproton charge-to-mass ratio
As consequences of this symmetry, conjugate particle-antiparticle pairs are created and annihilated in pair processes and have identical fundamental properties except for signs. This theoretical understanding is in conflict to our astronomical observations, which indicate that our Universe consists almost exclusively of matter [5]. This indicates that our understanding of the fundamental interactions is incomplete, since the Standard Model can neither explain the matter-antimatter asymmetry in our Universe, nor reproduce the observed matter excess based on the CP violation in the quark sector [6]
Summary
In the development of the Standard Model of particle physics, symmetries have played an important role [1]. We review recent precision measurements of the BASE collaboration, which improved the uncertainty of the proton and antiproton magnetic moments and the comparison of the proton-to-antiproton charge-to-mass ratio. In the experiments of the BASE collaboration, we compare the fundamental properties of protons and antiprotons, such as their lifetimes τp/p, charge-to-mass ratios (q/m)p/p, and magnetic moments μp/p.
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