1. Measurement of the Permanent Electric Dipole Moment of the $^{129}$Xe Atom
- Author
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Allmendinger, F., Engin, I., Heil, W., Karpuk, S., Krause, H. -J., Niederländer, B., Offenhäusser, A., Repetto, M., Schmidt, U., and Zimmer, S.
- Subjects
Physics - Atomic Physics - Abstract
We report on a new measurement of the CP-violating permanent Electric Dipole Moment (EDM) of the neutral $^{129}$Xe atom. Our experimental approach is based on the detection of the free precession of co-located nuclear spin-polarized $^3$He and $^{129}$Xe samples. The EDM measurement sensitivity benefits strongly from long spin coherence times of several hours achieved in diluted gases and homogeneous weak magnetic fields of about 400~nT. A finite EDM is indicated by a change in the precession frequency, as an electric field is periodically reversed with respect to the magnetic guiding field. Our result, $\left(-4.7\pm6.4\right)\cdot 10^{-28}$ ecm, is consistent with zero and is used to place a new upper limit on the $^{129}$Xe EDM: $|d_\text{Xe}|<1.5 \cdot 10^{-27}$ ecm (95% C.L.). We also discuss the implications of this result for various CP-violating observables as they relate to theories of physics beyond the standard model.
- Published
- 2019
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