# Relativistic many body theory of the electric dipole moment of $^{129}$Xe and its implications for probing new physics beyond the Standard Model

## TL;DR

This paper presents advanced relativistic many-body calculations of the electric dipole moment of $^{129}$Xe, aiming to improve constraints on new physics beyond the Standard Model by analyzing nuclear and electron-nucleus interactions.

## Contribution

It introduces precise relativistic coupled-cluster calculations of $^{129}$Xe EDM, including many-body effects and uncertainties, to aid in probing new physics.

## Key findings

- Relativistic effects contribute about 0.7% to NSM calculations.
- Triple excitations and Breit interaction uncertainties are quantified.
- Results will help tighten constraints on CP-violating parameters.

## Abstract

We report the results of our theoretical studies of the time-reversal and parity violating electric dipole moment (EDM) of $^{129}$Xe arising from the nuclear Schiff moment (NSM) and the electron-nucleus tensor-pseudotensor (T-PT) interaction based on the self-consistent and the normal relativistic coupled-cluster methods. The important many-body effects are highlighted and their contributions are explicitly presented. The uncertainties in the calculations of the correlation and relativistic effects are determined by estimating the contributions of the triples excitations, and the Breit interaction respectively, which together amount to about 0.7% for the NSM and 0.2% for the T-PT interactions. The results of our present work in combination with improved experimental limits for $^{129}$Xe EDM in the future would tighten the constraints on the hadronic CP violating quantities, and this could provide important insights into new physics beyond the Standard Model of elementary particles.