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. 2020 Feb 28;124(8):081803.
doi: 10.1103/PhysRevLett.124.081803.

Measurement of the Permanent Electric Dipole Moment of the Neutron

C Abel  1 , S Afach  2   3 , N J Ayres  1   3 , C A Baker  4 , G Ban  5 , G Bison  2 , K Bodek  6 , V Bondar  2   3   7 , M Burghoff  8 , E Chanel  9 , Z Chowdhuri  2 , P-J Chiu  2   3 , B Clement  10 , C B Crawford  11 , M Daum  2 , S Emmenegger  3 , L Ferraris-Bouchez  10 , M Fertl  2   3   12 , P Flaux  5 , B Franke  2   3 , A Fratangelo  9 , P Geltenbort  13 , K Green  4 , W C Griffith  1 , M van der Grinten  4 , Z D Grujić  14   15 , P G Harris  1 , L Hayen  7 , W Heil  12 , R Henneck  2 , V Hélaine  2   5 , N Hild  2   3 , Z Hodge  9 , M Horras  2   3 , P Iaydjiev  4 , S N Ivanov  4 , M Kasprzak  2   7   14 , Y Kermaidic  10 , K Kirch  2   3 , A Knecht  2   3 , P Knowles  14 , H-C Koch  2   12   14 , P A Koss  7 , S Komposch  2   3 , A Kozela  16 , A Kraft  2   12 , J Krempel  3 , M Kuźniak  2   6 , B Lauss  2 , T Lefort  5 , Y Lemière  5 , A Leredde  10 , P Mohanmurthy  2   3 , A Mtchedlishvili  2 , M Musgrave  1 , O Naviliat-Cuncic  5 , D Pais  2   3 , F M Piegsa  9 , E Pierre  2   5 , G Pignol  10 , C Plonka-Spehr  17 , P N Prashanth  7 , G Quéméner  5 , M Rawlik  3 , D Rebreyend  10 , I Rienäcker  2   3 , D Ries  2   3   17 , S Roccia  13   18 , G Rogel  5 , D Rozpedzik  6 , A Schnabel  8 , P Schmidt-Wellenburg  2 , N Severijns  7 , D Shiers  1 , R Tavakoli Dinani  7 , J A Thorne  1   9 , R Virot  10 , J Voigt  8 , A Weis  14 , E Wursten  7 , G Wyszynski  3   6 , J Zejma  6 , J Zenner  2   17 , G Zsigmond  2
Affiliations

Measurement of the Permanent Electric Dipole Moment of the Neutron

C Abel et al. Phys Rev Lett. .

Abstract

We present the result of an experiment to measure the electric dipole moment (EDM) of the neutron at the Paul Scherrer Institute using Ramsey's method of separated oscillating magnetic fields with ultracold neutrons. Our measurement stands in the long history of EDM experiments probing physics violating time-reversal invariance. The salient features of this experiment were the use of a ^{199}Hg comagnetometer and an array of optically pumped cesium vapor magnetometers to cancel and correct for magnetic-field changes. The statistical analysis was performed on blinded datasets by two separate groups, while the estimation of systematic effects profited from an unprecedented knowledge of the magnetic field. The measured value of the neutron EDM is d_{n}=(0.0±1.1_{stat}±0.2_{sys})×10^{-26} e.cm.

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