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A search for neutron to mirror-neutron oscillations using the nEDM apparatus at PSI
journal contribution
posted on 2023-06-09, 22:30 authored by Christopher Abel, N J Ayres, G Ban, G Bison, K Bodek, V Bondar, E Chanel, P-J Chiu, C Crawford, M Daum, RT Dinani, S Emmenegger, P Flaux, Clark GriffithClark GriffithIt has been proposed that there could be a mirror copy of the standard model particles, restoring the parity symmetry in the weak interaction on the global level. Oscillations between a neutral standard model particle, such as the neutron, and its mirror counterpart could potentially answer various standing issues in physics today. Astrophysical studies and terrestrial experiments led by ultracold neutron storage measurements have investigated neutron to mirror-neutron oscillations and imposed constraints on the theoretical parameters. Recently, further analysis of these ultracold neutron storage experiments has yielded statistically significant anomalous signals that may be interpreted as neutron to mirror-neutron oscillations, assuming nonzero mirror magnetic fields. The neutron electric dipole moment collaboration performed a dedicated search at the Paul Scherrer Institute and found no evidence of neutron to mirror- neutron oscillations. Thereby, the following new lower limits on the oscillation time were obtained: tnn' >352satB'=0(95%C.L.),tnn' >6sfor0.4µT9sfor 5.0 µT < B' < 25.4 µT (95% C.L.), where ß is the fixed angle between the applied magnetic field and the local mirror magnetic field, which is assumed to be bound to the Earth. These new constraints are the best measured so far around B' ~ 10 µT and B' ~ 20 µT.
Funding
Sussex Experimental Particle Physics 2015 Consolidated Grant; G1763; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/N000307/1
STFC Experimental Particle Physics 2018 Consolidated Grant; G2740; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/S000798/1
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Publication status
- Published
File Version
- Published version
Journal
Physics Letters BISSN
0370-2693Publisher
ElsevierExternal DOI
Volume
812Article number
a135993Pages
7.0Department affiliated with
- Physics and Astronomy Publications
Research groups affiliated with
- Experimental Particle Physics Research Group Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2020-12-17First Open Access (FOA) Date
2020-12-17First Compliant Deposit (FCD) Date
2020-12-16Usage metrics
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