Mainz 2026 – wissenschaftliches Programm

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SYFP: Symposium Tests of Fundamental Physics with AMO Systems

SYFP 1: Tests of fundamental physics with AMO systems

SYFP 1.4: Hauptvortrag

Freitag, 6. März 2026, 12:30–13:00, RW 1

Testing Baryon Asymmetry with Antiprotons — •Stefan Ulmer — Heinrich-Heine-Universität Düsseldorf, Germany — RIKEN, Japan

The BASE collaboration at CERN operates ultra sensitive multi-Penning-trap systems to compare the fundamental properties of protons and antiprotons with highest possible precision. We have compared the proton-to-antiproton charge-to-mass ratio with a fractional resolution of 16 parts in a trillion, which is the current most precise test of matter antimatter symmetry with baryons. In addition, our proton/antiproton magnetic moment comparisons reached a fractional accuracy of 1.5 parts in a trillion, measurements that improved the previous results in that sector by more than a factor of 3000. We have recently demonstrated the first coherent spectroscopy with a single antiproton spin, which heralds up to 100-fold improved magnetic moment measurements. Our experiments are currently limited by noise induced by CERN's accelerators. Thus, we are currently developing the transportable antiproton trap BASE-STEP, as well as state of the art offline laboratories at Heinrich-Heine-University Düsseldorf. Our ultimate goal is to transport antiprotons to this new facility to further improve resolution in high precision antiproton studies.

Keywords: Fundamental Symmetries; Precision Measurements; Antimatter; Penning Traps; Dark Matter