Speaker
Description
The standard model of particle physics provides one of the currently best descriptions of nature but fails to account for the asymmetry between matter and antimatter that is observed on cosmological scales. One way to investigate this problem is the test of CPT-Invariance by comparisons between fundamental proton and antiproton properties. [1]
The BASE collaboration is specialized in the use of advanced Penning trap setups as well as cryogenic superconducting detection systems with single particle resolution to perform high precision measurements on protons and antiprotons. Past measurements include the comparison of antiproton and proton charge-to-mass ratio with a fractional precision of 16 parts per trillion (ppt) [2] and the antiproton g-factor with a fractional precision of 1.5 parts per billion (ppb) [3]. This 3000-fold improvement of the g-factor precision helps to constrain possible CPT-odd interactions and sets limits on possible exotic particle interactions [4]. BASE is dedicated to further improving the precision of these measurements by continuously refining its Penning trap setup and is aiming to increase the g-factor precision to the 100 ppt level.
This contribution will give an overview of the BASE antiproton experiment located at CERN and aims to explain the unique challenge that sub-ppb precision g-factor measurements in accelerator halls pose. Focus is put on the understanding, characterization and if possible, the suppression of systematic corrections due to imperfections in the magnetic and electric fields.
[1] Hori, Masaki, and J. Walz, Progress in Particle and Nuclear Physics 72 (2013)
[2] M. J. Borchert et al., Nature 601, 35 (2022)
[3] C. Smorra et al., Nature 550, 371 (2017)
[4] Smorra, C., Stadnik, Y.V., Blessing, P.E. et al., Nature 575, 310 (2019).
