Semi-Hadronic Charge-Parity Violation Interaction Constants in CsAg, FrLi and FrAg molecules

TL;DR

This study calculates the nucleon-electron tensor-pseudotensor interaction constants in molecules like FrAg, demonstrating their potential for probing new physics beyond the Standard Model through precision measurements of charge-parity violation.

Contribution

The paper provides the first detailed relativistic calculations of Ne-TPT interaction constants in FrAg and similar molecules, highlighting their suitability for future experimental searches for new CP-violating physics.

Findings

FrAg has a large Ne-TPT interaction constant of 2.58 ± 0.21 kHz.

FrAg is an excellent candidate for probing physics beyond the Standard Model.

The study enhances understanding of molecules suitable for CP-violation experiments.

Abstract

We present a systematic study of the nucleon-electron tensor-pseudotensor (Ne-TPT) interaction in candidate molecules for next-generation experimental searches for new sources of charge-parity violation. The considered molecules are all amenable to assembly from laser-cooled atoms, with the francium-silver (FrAg) molecule previously shown to be the most sensitive to the Schiff moment interaction in this set. Interelectron correlation effects are treated through relativistic general-excitation-rank configuration-interaction theory in the framework of the Dirac-Coulomb Hamiltonian. We find in FrAg the Ne-TPT interaction constant to be $W_T({\text{Fr}}) = 2.58 \pm 0.21 [\left<\Sigma\right>_A \mathrm{kHz}]$, considering the Francium atom as target of the measurement. Taking into account nuclear structure in a multi-source interpretation of a measured electric dipole moment, FrAg is found to be an excellent probe of physics beyond the Standard Model as this system will in addition to its sizeable Ne-TPT interaction constant greatly constrain fundamental parameters such as the quantum-chromo-dynamic $\bar{\theta}$ or the semileptonic four-fermion interaction $C_{lequ}$ from which nuclear and atomic ${\cal{CP}}$-violating properties arise.