Systematic and statistical uncertainty evaluation of the HfF$^+$ electron electric dipole moment experiment

TL;DR

This paper reports a highly precise measurement of the electron's electric dipole moment using trapped HfF$^+$ ions, with significantly reduced systematic uncertainties and improved overall accuracy compared to previous experiments.

Contribution

It introduces a comprehensive evaluation of systematic uncertainties and demonstrates a 30-fold reduction in these uncertainties, enhancing the measurement's precision.

Findings

Systematic uncertainty reduced by a factor of 30.

Overall measurement accuracy improved by a factor of 2.

First to thoroughly evaluate systematic shifts in this context.

Abstract

We have completed a new precision measurement of the electron's electric dipole moment using trapped HfF$^+$ in rotating bias fields. We report on the accuracy evaluation of this measurement, describing the mechanisms behind our systematic shifts. Our systematic uncertainty is reduced by a factor of 30 compared to the first generation of this measurement. Our combined statistical and systematic accuracy is improved by a factor of 2 relative to any previous measurement.