Heinz Maier-Leibniz Prize

Dominika Wylezalek (ZAH) has been awarded the Heinz Maier-Leibniz Prize   more ...

The faculty mourns Bogdan Povh

Bogdan Povh was appointed professor at Heidelberg University in 1965 and has played a decisive role in shaping the Heidelberg research lands   more ...


The Faculty of Physics and Astronomy is looking forward to Girls' Day on 25 April 2024 at Heidelberg University!   more ...

SNP SE Stipends 2023 awarded

The SNP SE-Stipends 2023 have been awarded to Rabea Freis and Nils Bock.   more ...

Maria Goeppert-Mayer Prize awarded

Karen Wadenpfuhl and Benedikt Schosser are the recipients of the Maria Goeppert-Mayer Prize.   more ...

Wilhelm and Else Heraeus Dissertation prize 2023

The prize for an outstanding dissertations in 2023 has been awarded.   more ...

Top 10 Breakthrough of the Year 2023

Results on simulating quantum fields in curved and expanding spacetimes chosen as a Top 10 Breakthrough of the Year 2023 by Physics World   more ...

Physics colloquium

Friday, 19. April 2024 5:00 pm  High-Precision Comparisons of the Fundamental Properties of Protons and Antiprotons

Prof. Dr. Stefan Ulmer, Institut für Experimentalphysik, Heinrich Heine Universität Düsseldorf

The Standard Model of particle physics is incredibly successful but glaringly incomplete. Among the questions left open is the striking imbalance of matter and antimatter in our universe, which inspires experiments to compare the fundamental properties of matter/antimatter conjugates with high precision. The BASE collaboration at the antiproton decelerator of CERN is performing such high-precision comparisons with protons and antiprotons. Using advanced cryogenic Penning traps, we have performed the most precise comparison of the proton-to-antiproton charge-to-mass ratio with a fractional uncertainty of 16 parts in a trillion [1]. In another measurement, we have invented a novel spectroscopy technique, that allowed for the first direct measurement of the antiproton magnetic moment with a fractional precision of 1.5 parts in a billion [2]. Together with our last measurement of the proton magnetic moment [3] this improves the precision of previous magnetic moment based tests of the fundamental CPT invariance by more than a factor of 3000. A time series analysis of the sampled magnetic moment resonance furthermore enabled us to set first direct constraints on the interaction of antiprotons with axion-like particles (ALPs) [4], and most recently, we have used our ultra-sensitive single particle detection systems to derive constraints on the conversion of ALPs into photons [5]. In parallel we are working on the implementation of new measurement technology to sympathetically cool antiprotons [6] and to apply quantum logic inspired spectroscopy techniques [7]. In addition to that, we are currently developing the transportable antiproton-trap BASE-STEP, to relocate antiproton spectroscopy experiments from accelerator environment to dedicated precision laboratory space at Heinrich Heine University Düsseldorf. I will give a general introduction to the topic, will review the recent results produced by BASE, with particular focus on recent developments towards an at least 10-fold improved measurement of the antiproton magnetic moment.

[1] M. J. Borchert et al., Nature 601, 35 (2022).
[2] C. Smorra et al., Nature 550, 371 (2017).
[3] G. Schneider et al., Science 358, 1081 (2017).
[4] C. Smorra et al., Nature 575, 310 (2019).
[5] J. A. Devlin et al., Phys. Rev. Lett. 126, 041321 (2021).
[6] M. A. Bohman et al. Nature 596, 514 (2021)
[7] J. M Conrejo et al., New J. Phys. 23 073045



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