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Statistical sensitivity of the nEDM apparatus at PSI to neutron mirror-neutron oscillations | C. Abel
; N. Ayres
; G. Bison
; K. Bodek
; V. Bondar
; P.-J. Chiu
; M. Daum
; S. Emmenegger
; P. Flaux
; L. Ferraris-Bouchez
; W. C. Griffth
; N. Hild
; K. Kirch
; P. A. Koss
; A. Kozela
; J. Krempel
; B. Lauss
; T. Lefort
; A. Leredde
; P. Mohanmurthy
; O. Naviliat-Cuncic
; D. Pais
; F. M. Piegsa
; G. Pignol
; M. Rawlik
; D. Rebreyend
; D. Ries
; S. Roccia
; D. Rozpedzik
; P. Schmidt-Wellenburg
; A. Schnabel
; N. Severijns
; J. Thorne
; R. Virot
; G. Zsigmond
; | Date: |
6 Nov 2018 | Abstract: | The Neutron and its mirror counterpart, a sterile state degenerate in mass,
could spontaneously mix in a process much faster than the neutron
$eta$-decay. Two separate groups have performed series of experiments in
search of mirror-neutron oscillations and reported having found no evidence,
setting stringent limits on the oscillation time $ au_{nn’}$. Recently, these
data sets have been further analyzed, and statistically significant signals
compatible with neutron mirror-neutron oscillations in the presence of mirror
magnetic fields, have been found. The current leading constraint on
$ au_{nn’}$ does not exclude these signals. The neutron Electric Dipole Moment
Collaboration based at the Paul Scherrer Institute performed a new series of
experiments to test these signals. In this paper, we describe and motivate our
choice of run configurations with an optimal filling time of $29~$s, storage
times of $180~$s and $380~$s, and applied magnetic fields of $10~mu$T and
$20~mu$T. The choice of these run configurations provide for a reliable
overlap in performance with the previous efforts and also optimizes the
sensitivity to test the signals. We also elaborate upon the technique of
normalizing the neutron counts, making such a counting experiment based on the
ultra-cold neutron source at Paul Scherrer Institute possible. Furthermore, the
magnetic field characterization has been demonstrated to meet the requirements
of this neutron mirror-neutron search. Finally, we show that this effort has a
statistical sensitivity comparable to the current leading constraints for
neutron mirror-neutron oscillation. | Source: | arXiv, 1811.1906 | Services: | Forum | Review | PDF | Favorites |
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