ICHEP 2020

28 July 2020 to 6 August 2020
virtual conference
Europe/Prague timezone

New measurement of the neutron electric dipole moment at PSI

29 Jul 2020, 17:15
15m
virtual conference

virtual conference

Talk 03. Beyond the Standard Model

Speaker

Benoit Eric Clement (Centre National de la Recherche Scientifique (FR))

Description

The electric dipole moment (EDM) of the neutron is a strong probe of CP violation beyond the Standard Model. In particular, its value could reveal information on baryogenesis. We report the latest result from the nEDM collaboration, which operates an experiment to measure the neutron EDM at the Paul Scherrer Institute using Ramsey’s method of separated oscillating magnetic fields with ultracold neutrons. The salient features of this experiment were the use of a 199Hg comagnetometer and an array of optically pumped cesium vapor magnetometers to cancel and correct for magnetic-field changes. Two separate groups performed the statistical analysis on blinded datasets, while the estimation of systematic effects profited from an unprecedented knowledge of the magnetic field. Therefore, the obtained precision is dominated by statistical uncertainties. the systematic precision was improved by a factor 5 with respect to previous experiments opening the way to improved sensitivity in the next generation of experiments. The observed EDM is compatible with zero and a new improved limit, $|d|<1.8\times 10^{-26}$ e.cm @ 90% CL, was set.

 Secondary track (number) 05

Primary author

Benoit Eric Clement (Centre National de la Recherche Scientifique (FR))