18-22 October 2021
Matsue, Shimane Prefecture, Japan
Asia/Tokyo timezone

Result of the neutron EDM starch at PSI

19 Oct 2021, 16:50
Matsue, Shimane Prefecture, Japan

Matsue, Shimane Prefecture, Japan

Matsue City, Shimane Prefecture, Japan
Plenary presentations Plenary Presentations


Georg Bison (Paul Scherrer Institut)


We report on the result of the neutron EDM experiment which took data in 2015 and 2016 at PSIs ultracold neutron source. The neutron EDM is deemed to be one of the most sensitive probes of physics beyond the standard model. The experiment measured the precession frequency of spin polarized neutrons as a function of a strong electric field. The electric dipole moment of the neutrons leads to a linear dependence between those two quantities. After a blinded data analysis by two independent teams, we concluded that our results do not show this dependence within statistical uncertainties. We thus published a new upper limit of $d_n < 1.8 \,10^{-26} e\, \mathrm{cm}$ [1]. The new result also significantly improves systematic uncertainties which will be discussed in detail. We will also give a future outlook on our new apparatus, n2EDM, which is currently set up at PSI.

[1] C. Abel et al. “Measurement of the Permanent Electric Dipole Moment of the Neutron” Phys. Rev. Lett. 124, 081803 (2020) 10.1103/PhysRevLett.124.081803.

Primary author

Georg Bison (Paul Scherrer Institut)

Presentation Materials