Atomic electric-dipole moments from Higgs-boson-mediated interactions

Electric-dipole moments of paramagnetic atoms can provide important insights into a unique kind of CP violation involving Higgs-boson-mediated interactions between leptons and hadrons. We report a limit for the coupling constant of such an interaction by combining the results of our relativistic many-body calculations and experimental data on the electric-dipole moment of atomic thallium. The importance of electron correlation in determining this limit is highlighted and its significance in the context of particle physics and cosmology is pointed out.

Figure 1

(Color online) Scalar-pseudoscalar electron $\left(e\right)$ and nucleus $\left(N\right)$ interaction due to exchange of a Higgs $\left(H\right)$ particle. Here $e_L$ and $e_R$ represent left- and right-handed electrons, respectively.

Figure 2

(Color online) Important correlation diagrams for EDM. Dipole operator $\left(D\right)$ is shown by the dotted line with a circle. $T_1^{\left(1\right)}$, $S_{1v}^{\left(1\right)}$, and $S_{2v}^{\left(1\right)}$ represent first-order S-PS EDM perturbed $T_1$, $S_{1v}$, and $S_{2v}$ operators, respectively.

Figure 3

(Color online) Limit of the $C_s$ values obtained from different atomic theories.