Comment on "New physics constraints from atomic parity violation in 133-Cs"

TL;DR

This paper critiques a recent calculation of atomic parity violation in cesium, highlighting omitted contributions and underestimation of theoretical uncertainties, especially regarding QED radiative corrections.

Contribution

It identifies missing key contributions and corrects the underestimated uncertainty in the previous theoretical calculation.

Findings

Key contributions were omitted in the original calculation.

The actual theoretical uncertainty is significantly larger than claimed.

QED radiative corrections are more substantial than previously estimated.

Abstract

In a recent Letter [B. K. Sahoo, B. P. Das, and H. Spiesberger, Phys. Rev. D 103, L111303 (2021)], a calculation of the parity violating 6S-7S E1 amplitude in Cs is reported, claiming an uncertainty of just 0.3%. In this Comment, we point out that key contributions have been omitted, and the theoretical uncertainty has been significantly underestimated. In particular, the contribution of missed QED radiative corrections amounts to several times the claimed uncertainty.