Improved limits on the hadronic and semihadronic CP violating parameters and role of a dark force carrier in the electric dipole moment of ~(199)Hg

摘要

Combining the recently reported electric dipole moment (EDM) of the ~(199)Hg 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 d_n < 2.2 × 10~(-26) |e|cm and d_p < 2.1 × 10~(-25) |e|cm, respectively, and on the quantum chromodynamics parameter and the combined up- and down-quark chromo-EDMs as |θ| <1.1 × 10~(-10) and |d_u ?d_d| < 5.5 × 10~(?27) |e|cm, respectively. These are the best limits to date to probe new sources of CP violation beyond the standard model from a diamagnetic atom. The role of a capable manybody 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 χ between the atomic electrons and nucleus are given.