Combining the recently reported electric dipole moment (EDM) of $^{ 199}$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 (NSM) interactions are determined. Using these limits with the nuclear calculations, we infer limits on the EDMs of neutron and proton as $d_n < 2.2 \times 10^{ -26} |e| \rm{ cm}$ and $d_p < 2.1 \times 10^{ -25} |e| \rm{ cm}$, respectively, and on the quantum chromodynamics (QCD) parameter and the combined up- and down- quark chromo-EDMs as $|\bar{ \theta}| < 1.1 \times 10^{ -10}$ and $|\tilde{ d}_u - \tilde{ d}_d| < 5.5 \times 10^{ -27} |e|\rm{ cm}$, respectively. These are the best limits till date to probe new sources of CP violation beyond the standard model (SM) from a diamagnetic atom. Role of considering a capable many-body method to account 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 $\chi$ between the atomic electrons and nucleus are given.
Categories: hep-ph nucl-th physics.atom-ph