New example of CP violation from search for the permanent electric dipole moment of Cs atoms

TL;DR

This paper reports the measurement of a permanent electric dipole moment in Cesium atoms, providing evidence of CP violation, with detailed experimental procedures that can be replicated.

Contribution

The study presents a novel measurement of the Cs atom's EDM, indicating CP violation, and details an experimental setup for future verification.

Findings

Measured Cs atom EDM: 2.97×10⁻²⁹ C·m

Observed saturation polarization at E=7.4×10⁴ V/m

Detected new CP violation evidence in Cs atoms

Abstract

Using special capacitors three experiments to search for a permanent electric dipole moment (EDM) of Cesium atom were completed. The electric susceptibility xe of Cs vapor varies in direct proportion to the density N, where xe =70 when N=7.37*1022 m-3! The relationship between xe of Cs vapor and the absolute temperatures T is xe =B/T, where the slope B=320(k) as polar molecules H2O(B=1.50(k)). Its capacitance C at different voltage V was measured. The C-V curve shows that the saturation polarization of Cs vapor has be observed when the field E=7.4*104V/m. Our measurements give the EDM of an Cs atom : dCs=2.97*10-29 C.m=1.86*10-8 e.cm. New example of CP (charge conjugation and parity) violation occurred in Cs atoms. Our results are easy to be repeated because the details of the experiment are described in the article.