A search for neutron to mirror-neutron oscillations

• URL: http://arxiv.org/abs/2009.11046v2
• Date: Thu, 19 Nov 2020 18:48:09 GMT
• Title: A search for neutron to mirror-neutron oscillations
• Authors: C. Abel (a), N. J. Ayres (b), G. Ban (c), G. Bison (d), K. Bodek (e), V. Bondar (b), E. Chanel (f), P.-J. Chiu (b, d), C. Crawford (g), M. Daum (d), R. T. Dinani (h), S. Emmenegger (b), P. Flaux (c), L. Ferraris-Bouchez (i), W. C. Griffith (a), Z. D. Grujic (j,1), N. Hild (b, d), K. Kirch (b, d), H.-C. Koch (d), P.A. Koss (h), A. Kozela (k), J. Krempel (b), B. Lauss (d), T. Lefort (c), A. Leredde (i), P. Mohanmurthy (b, d,2), O. Naviliat-Cuncic (c), D. Pais (b, d), F. M. Piegsa (f), G. Pignol (i), M. Rawlik (b, d), D. Rebreyend (i), I. Rienaecker (b, d), D. Ries (l), S. Roccia (i, m), D. Rozpedzik (e), P. Schmidt-Wellenburg (d), N. Severijns (h), J. Thorne (f), A. Weis (j), E. Wursten (h,3), J. Zejma (e) and G. Zsigmond (d) ((a) Department of Physics and Astronomy, University of Sussex, Brighton, United Kingdom, (b) Institute for Particle Physics and Astrophysics, ETH Z\"urich, Switzerland, (c) Normandie Universit\'e, ENSICAEN, UNICAEN, CNRS/IN2P3, Caen, France, (d) Paul Scherrer Institut, Switzerland, (e) Marian Smoluchowski Institute of Physics, Jagiellonian University, Krak\'ow, Poland, (f) Laboratory for High Energy Physics and Albert Einstein Center for Fundamental Physics, University of Bern, Switzerland, (g) University of Kentucky, Lexington, KY, (h) Institute for Nuclear and Radiation Physics, KU Leuven, Belgium, (i) Laboratoire de Physique Subatomique et de Cosmologie, Universit\'e Grenoble Alpes, CNRS/IN2P3, Grenoble, France, (j) University of Fribourg, Switzerland, (k) Henryk Niedwodniczanski Institute of Nuclear Physics, Krak\'ow, Poland, (l) Department of Chemistry - TRIGA site, Johannes Gutenberg University Mainz, Germany, (m) Institut Laue-Langevin, Grenoble, France)
• Abstract summary: Astrophysical studies and terrestrial experiments led by ultracold neutron storage measurements have investigated neutron to mirror-neutron oscillations. Recent analysis of these ultracold neutron storage experiments has yielded statistically significant anomalous signals that may be interpreted as neutron to mirror-neutron oscillations.
• Score: 0.22705102969616636
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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: $\tau_{nn'} > 352~$s at $B'=0$ (95% C.L.), $\tau_{nn'} > 6~\text{s}$ for all $0.4~\mu\text{T}<B'<25.7~\mu\text{T}$ (95% C.L.), and $\tau_{nn'}/\sqrt{\cos\beta}>9~\text{s}$ for all $5.0~\mu\text{T}<B'<25.4~\mu\text{T}$ (95% C.L.), where $\beta$ 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 $B'\sim10~\mu$T, and $B'\sim20~\mu$T.

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