Abstract
Combining the recently reported electric dipole moment (EDM) of the atom due to breaking of parity and time-reversal symmetries with the improved relativistic atomic calculations, precise limits on the tensor-pseudotensor (T-PT) electron-nucleus (e-N) coupling coefficient and the nuclear Schiff moment interactions are determined. Using these limits with the nuclear calculations, we infer limits on the EDMs of the neutron and proton as and , respectively, and on the quantum chromodynamics parameter and the combined up- and down-quark chromo-EDMs as and , respectively. These are the best limits to date to probe new sources of violation beyond the standard model from a diamagnetic atom. The role of a capable many-body method to account for the electron correlation effects to all orders for inferring the above limits has been highlighted. From this analysis, constraints on the T-PT e-N coupling coefficient with a large range of mass of a possible dark matter carrier between the atomic electrons and nucleus are given.
- Received 1 December 2016
DOI:https://doi.org/10.1103/PhysRevD.95.013002
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