# Dependence of atomic parity-violation effects on neutron skins and new physics

## TL;DR

This paper analyzes how nuclear structure and potential new physics influence atomic parity violation effects, providing formulas and calculations to guide optimal isotope selection for experiments.

## Contribution

It introduces general expressions and specific coefficients to evaluate the sensitivity of isotopic ratios to neutron skins and beyond Standard Model couplings.

## Key findings

- Formulas for isotopic ratio sensitivities to neutron skins and new physics.
- Calculated coefficients for various isotopes using Fermi nuclear density distributions.
- Guidance on selecting isotopes for atomic PNC experiments.

## Abstract

We estimate the relative contribution of nuclear structure and new physics couplings to the parity non-conserving spin-independent effects in atomic systems, for both single isotopes and isotopic ratios. General expressions are presented to assess the sensitivity of isotopic ratios to neutron skins and to couplings beyond standard model at tree level. The specific coefficients for these contributions are calculated assuming Fermi distribution for proton and neutron nuclear densities for isotopes of Cs, Ba, Sm, Dy, Yb, Pb, Fr, and Ra. The present work aims to provide a guide to the choice of the best isotopes and pairs of isotopes for conducting atomic PNC measurements.