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Indirect searches for dark matter with the nEDM spectrometer

S. Roccia, G. Zsigmond on behalf of the nEDM collaboration at PSI

SciPost Phys. Proc. 5, 028 (2021) · published 6 September 2021

Proceedings event

Review of Particle Physics at PSI


The nEDM apparatus at PSI has been used to search for different dark matter signatures utilizing its high sensitivity to shifts in the neutron precession frequency and its well-controlled low magnetic field at the microT level. Such a shift could be interpreted as a consequence of a short-range spin-dependent interaction that could possibly be mediated by axions or axion-like particles, or as an axion-induced oscillating electric dipole moment of the neutron. Another search, based on so-called UCN disappearance measurements, targeted previously reported signals of neutron to mirror-neutron oscillations. These dark matter searches confirmed and improved previous results, as detailed in this review.

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