Experimental perspectives on the matter–antimatter asymmetry puzzle: developments in electron EDM and H¯ experiments

Abstract

In the search for clues to the matter–antimatter puzzle, experiments with atoms or molecules play a particular role. These systems allow measurements with very high precision, as demonstrated by the unprecedented limits down to 10 − 30 e cm on electron EDM using molecular ions, and relative measurements at the level of 10 − 12 in spectroscopy of antihydrogen atoms. Building on these impressive measurements, new experimental directions offer potential for drastic improvements. We review here some of the new perspectives in those fields and their associated prospects for new physics searches. This article is part of the theme issue ‘The particle-gravity frontier’.

The particle-gravity frontier

“…The latter, for instance, will check with considerable increase in precision for any seasonal effect in the detector claimed by previous measurements as possible evidence for the Earth passing through possible dark matter in space. Finally, Malbrunot and collaborators discuss the status and future experimental prospects for investigations of fundamental CP and CPT symmetries in low-energy precision experiments [22]. The electron electric dipole moment measured using molecular ions vanishes to O (10 −30 ) e cm, which constrains possible new CP-violating interactions to similar accuracy to the results from LHC high-energy collisions.…”

“…Finally, Malbrunot and collaborators discuss the status and future experimental prospects for investigations of fundamental CP and CPT symmetries in low-energy precision experiments [ 22 ]. The electron electric dipole moment measured using molecular ions vanishes to , which constrains possible new CP-violating interactions to similar accuracy to the results from LHC high-energy collisions.…”

The cosmological constant and scale hierarchies with emergent gauge symmetries

“…Today a vigorous programme of experiments and theory is probing the high energy and precision frontiers together with cosmology looking for cracks in our description of Nature provided by the Standard Model and General Relativity. Ideas for new physics are discussed in the parallel theoretical contributions to this volume [15][16][17] with experiments discussed in [9,[18][19][20][21][22].…”