All that Antimatters in the Universe

Session

Antimatter experiments at low energies

21 Jan 2026, 09:00

503/1-001 - Council Chamber (CERN)

Conveners

Antimatter experiments at low energies

• Barbara Maria Latacz (CERN)

Antimatter experiments at low energies

• Michael Charlton (Swansea University)

32. Antimatter experiments at low energies

Prof. Klaus (KHKJ) Jungmann (University of Groningen)

21/01/2026, 09:00

Oral

1. Antiprotons Under the Precision Microscope

Prof. Stefan Ulmer (HHU Düsseldorf / RIKEN)

21/01/2026, 09:45

Oral

The BASE collaboration is performing the most precise measurements of the fundamental properties of the proton and the antiproton. Charge-to-mass ratios were compared with a fractional resolution on the 16 parts in a trillion level, and coherent antiproton spin spectroscopy will establish measurements on the sub-parts per billion level. In addition to these world-record measurements, we have...

31. Testing Fundamental Physics with Antimatter Systems (R)

Dr Yevgeny Stadnik (The University of Sydney)

21/01/2026, 10:30

Oral

3. Antihydrogen yield in AD experiments

Eric Hunter (CERN)

21/01/2026, 11:15

Both oral and poster

ASACUSA produces millions of antihydrogen atoms in every 15-minute experimental cycle. Most of the atoms hit the wall of the trap and annihilate microseconds after formation, and only a small fraction, 0.1% or less, survive long enough to be used in our spectroscopy apparatus. This statement is true of all trap-based experiments (AEgIS, ALPHA, and ASACUSA), and it motivates us to further...

42. Coherent spectroscopy with a single antiproton spin for the antiproton magnetic moment measurements in BASE

Dr Barbara Maria Latacz (CERN)

21/01/2026, 11:30

Oral

BASE - The Baryon-Antibaryon Symmetry Experiment - is dedicated to conduct ultra-precise tests of Charge Parity Time reversal invariance by comparing key intrinsic properties of protons and antiprotons, such as their charge-to-mass ratios, lifetimes, and magnetic moments.
In this presentation, we will highlight our flagship experiment at CERN, which is currently focused on achieving 10- to...

62. Advances towards measuring the gravitational free-fall of an antiatom beam at the AEgIS experiment

Ruggero Caravita (Universita degli Studi di Trento and INFN (IT))

21/01/2026, 11:45

Oral

The AEgIS (Antimatter Experiment, Gravity, Interferometry, and Spectroscopy) experiment,
based at CERN’s Antiproton Decelerator facility, aims to perform gravitational experiments
using beams of neutral antiatoms (antihydrogen and positronium) in the absence of external
fields. A key objective of AEgIS is to make the first direct measurement of the free-fall
acceleration of antihydrogen...

55. Precision laser spectroscopy of exotic helium atoms to determine the antiproton-to-electron mass ratio, and the charged pion and kaon masses

Masaki Hori (Imperial College London)

21/01/2026, 12:00

Oral

The ASACUSA collaboration of CERN carries out precision laser spectroscopy of exotic helium atoms that contain antiprotons at CERN's Antiproton Decelerator, and pions at PSI's 590 MeV Ring Cyclotron facility. In the future we plan to extend these studies to determine the antiproton-to-electron mass ratio and the charged pion mass to much higher precision than before. We are also carrying out...

63. Towards a future test of CPT Invariance by spectroscopy of H$_2^+$ and $\overline{\mathrm{H}}^-_2$

Prof. Stephan Schiller (Heinrich-Heine-Universität Düsseldorf)

21/01/2026, 12:15

Oral

Recently, there has been impressive progress on the spectroscopy of molecular hydrogen ions, in both r.f. and Penning traps, at several laboratories (Paris, Zürich, Heidelberg, Amsterdam, Düsseldorf). This includes the first laser spectroscopy of H$_2^+$ [1, 2]. It is thus of interest to consider in more detail the proposals [3, 4] of comparing a vibrational transition frequency of H$_{2}^+$...