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Measurement of the Permanent Electric Dipole Moment of the $^{129}$Xe Atom
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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.
Forward citations
Cited by 2 Pith papers
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Relativistic many body theory of the electric dipole moment of $^{129}$Xe and its implications for probing new physics beyond the Standard Model
The authors use two relativistic coupled-cluster methods to compute xenon-129's EDM sensitivity to nuclear Schiff moments and electron-nucleus tensor-pseudotensor interactions, with claimed uncertainties below 1%.
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Analysis of Electric Dipole Moment of $^{225}$Ra Atom using the Relativistic Normal Coupled-cluster Theory
The recommended 225Ra electric dipole moment enhancement factors are -6.29(1) x 10^-17 |e| cm/(|e| fm^3) for the Schiff moment and -12.66(14) x 10^-20 <sigma_N> |e| cm for the T-PT interaction, with alpha_d = 244(13) ea0^3.
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