CP violating effects in $^{210}$Fr and prospects for new physics beyond the Standard Model

TL;DR

This paper presents theoretical calculations of the electric dipole moment of $^{210}$Fr, highlighting its potential to constrain new physics beyond the Standard Model through precise evaluation of CP violation effects.

Contribution

The study employs relativistic coupled-cluster theory to accurately evaluate CP violating enhancement factors in $^{210}$Fr, aiding future experimental constraints on new physics.

Findings

Calculated enhancement factors with 3% accuracy

Analyzed many-body effects on CP violation

Provided constraints on beyond Standard Model theories

Abstract

We report theoretical results of the electric dipole moment (EDM) of $^{210}$Fr which arises from the interaction of the EDM of an electron with the internal electric field in an atom and the scalar-pseudoscalar electron-nucleus interaction; the two dominant sources of CP violation in this atom. Employing the relativistic coupled-cluster theory, we evaluate the enhancement factors for these two CP violating interactions to an accuracy of about 3% and analyze the contributions of the many-body effects. These two quantities in combination with the projected sensitivity of the $^{210}$Fr EDM experiment provide constraints on new physics beyond the Standard Model. Particularly, we demonstrate that their precise values are necessary to account for the effect of the bottom quark in models in which the Higgs sector is augmented by nonstandard Yukawa interactions such as the two-Higgs doublet model.