A search for neutron to mirror-neutron oscillations using the nEDM apparatus at PSI

Abel, C, Ayres, N J, Ban, G, Bison, G, Bodek, K, Bondar, V, Chanel, E, Chiu, P-J, Crawford, C, Daum, M, Dinani, RT, Emmenegger, S, Flaux, P and Griffith, Clark (2021) A search for neutron to mirror-neutron oscillations using the nEDM apparatus at PSI. Physics Letters B, 812. a135993. ISSN 0370-2693

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Abstract

It 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: τnn′ >352satB′=0(95%C.L.),τnn′ >6sfor0.4μT<B′<25.7μT(95%C.L.),andτnn′/√cosβ>9sfor 5.0 μT < B′ < 25.4 μT (95% C.L.), where β 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.

Item Type: Article
Keywords: UCN, mirror neutron oscillations
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Experimental Particle Physics Research Group
SWORD Depositor: Mx Elements Account
Depositing User: Mx Elements Account
Date Deposited: 17 Dec 2020 15:48
Last Modified: 17 Dec 2020 16:00
URI: http://sro.sussex.ac.uk/id/eprint/95831

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