Antihydrogen is an exciting tool for testing fundamental physics. Antihydrogen can reproducibly be synthesized and trapped in the laboratory for extended periods of time [1][2], offering an opportunity to study its properties with high precision. Of particular interest is the two-photon 1S-2S transition, due to the staggering precision of which it has been measured in hydrogen [3]. Since only...
The observed baryon asymmetry in our universe challenges the Standard Model of particle physics and motivates sensitive tests of CPT invariance. Inspired by this, the BASE experiment at CERN compares the fundamental properties of antiprotons and protons with high precision using an ultra-low noise cryogenic multi-Penning trap apparatus.
One particular challenge is imposed by electric-field...
We, the BASE collaboration, perform most precise tests of the CPT symmetry in the baryon sector by measurements of the fundamental properties of protons and antiprotons. Our recent 300 ppt measurement of the proton magnetic moment at the proton g-factor experiment in Mainz is predominantly limited by statistics [1]. The reason is that the current use of sub-thermal cooling of a single proton...
The ALPHA colaboration has recently demonstrated laser and microwave spectroscopy of several
different transitions in the antihydrogen atom. Since we typically trap around only twenty
antihydrogen atoms per experimental cycle, in these experiments we choose to accumulate hundreds
of antihydrogen atoms over time scales ranging from tens of minutes to many hours in order to have
a sufficient...
