CERN Accelerating science

Article
Report number	arXiv:2001.11966
Title	Measurement of the Permanent Electric Dipole Moment of the Neutron
Author(s)	Abel, C. (Sussex U.) ; Afach, S. (PSI, Villigen ; Zurich, ETH) ; Ayres, N.J. (Sussex U. ; Zurich, ETH) ; Baker, C.A. (Rutherford) ; Ban, G. (Caen U.) ; Bison, G. (PSI, Villigen) ; Bodek, K. (Jagiellonian U.) ; Bondar, V. (PSI, Villigen ; Zurich, ETH ; Leuven U.) ; Burghoff, M. (Berlin, Phys. Tech. Bund.) ; Chanel, E. (U. Bern, AEC) ; Chowdhuri, Z. (PSI, Villigen) ; Chiu, P.-J. (PSI, Villigen ; Zurich, ETH) ; Clement, B. (LPSC, Grenoble) ; Crawford, C.B. (Kentucky U.) ; Daum, M. (PSI, Villigen) ; Emmenegger, S. (Zurich, ETH) ; Ferraris-Bouchez, L. (LPSC, Grenoble) ; Fertl, M. (PSI, Villigen ; Zurich, ETH ; Mainz U., Inst. Phys.) ; Flaux, P. (Caen U.) ; Franke, B. (PSI, Villigen ; Zurich, ETH) ; Fratangelo, A. (U. Bern, AEC) ; Geltenbort, P. (Laue-Langevin Inst.) ; Green, K. (Rutherford) ; Griffith, W.C. (Sussex U.) ; van der Grinten, M. (Rutherford) ; Grujić, Z.D. (Fribourg U. ; Belgrade, Inst. Phys.) ; Harris, P.G. (Sussex U.) ; Hayen, L. (Leuven U.) ; Heil, W. (Mainz U., Inst. Phys.) ; Henneck, R. (PSI, Villigen) ; Hélaine, V. (PSI, Villigen ; Caen U.) ; Hild, N. (PSI, Villigen ; Zurich, ETH) ; Hodge, Z. (U. Bern, AEC) ; Horras, M. (PSI, Villigen ; Zurich, ETH) ; Iaydjiev, P. (Rutherford) ; Ivanov, S.N. (Rutherford) ; Kasprzak, M. (PSI, Villigen ; Leuven U.) ; Kermaidic, Y. (LPSC, Grenoble) ; Kirch, K. (PSI, Villigen ; Zurich, ETH) ; Knecht, A. (PSI, Villigen ; Zurich, ETH) ; Knowles, P. (Fribourg U.) ; Koch, H.-C. (PSI, Villigen ; Fribourg U. ; Mainz U., Inst. Phys.) ; Koss, P.A. (Leuven U.) ; Komposch, S. (PSI, Villigen ; Zurich, ETH) ; Kozela, A. (Cracow, INP) ; Kraft, A. (PSI, Villigen ; Mainz U., Inst. Phys.) ; Krempel, J. (Zurich, ETH) ; Kuźniak, M. (PSI, Villigen ; Jagiellonian U.) ; Lauss, B. (PSI, Villigen) ; Lefort, T. (Caen U.) ; Lemière, Y. (Caen U.) ; Leredde, A. (LPSC, Grenoble) ; Mohanmurthy, P. (PSI, Villigen) ; Mtchedlishvili, A. (PSI, Villigen) ; Musgrave, M. (Sussex U.) ; Naviliat-Cuncic, O. (Caen U.) ; Pais, D. (PSI, Villigen) ; Piegsa, F.M. (U. Bern, AEC) ; Pierre, E. (PSI, Villigen) ; Pignol, G. (LPSC, Grenoble) ; Plonka-Spehr, C. (Mainz U., Inst. Kernphys.) ; Prashanth, P.N. (Leuven U.) ; Quéméner, G. (Caen U.) ; Rawlik, M. (Zurich, ETH) ; Rebreyend, D. (LPSC, Grenoble) ; Rienäcker, I. (PSI, Villigen) ; Ries, D. (PSI, Villigen) ; Roccia, S. (Laue-Langevin Inst.) ; Rogel, G. (Caen U.) ; Rozpedzik, D. (Jagiellonian U.) ; Schnabel, A. (Berlin, Phys. Tech. Bund.) ; Schmidt-Wellenburg, P. (PSI, Villigen) ; Severijns, N. (Leuven U.) ; Shiers, D. (Sussex U.) ; Tavakoli Dinani, R. (Leuven U.) ; Thorne, J.A. (Sussex U.) ; Virot, R. (LPSC, Grenoble) ; Voigt, J. (Berlin, Phys. Tech. Bund.) ; Weis, A. (Fribourg U.) ; Wursten, E. (Leuven U. ; CERN) ; Wyszynski, G. (Zurich, ETH) ; Zejma, J. (Jagiellonian U.) ; Zenner, J. (PSI, Villigen) ; Zsigmond, G. (PSI, Villigen)
Publication	2020-02-29
Imprint	2020-01-31
Number of pages	7
Note	5 pages, 4 figures, submitted to PRL on 18.12.2019
In:	Phys. Rev. Lett. 124 (2020) 081803
DOI	10.1103/PhysRevLett.124.081803
Subject category	Detectors and Experimental Techniques ; Particle Physics - Experiment ; Nuclear Physics - Experiment
Accelerator/Facility, Experiment	PSI nEDM
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 (UCN). 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 Hg-199 co-magnetometer 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 $d_{\rm n} = (0.0\pm1.1_{\rm stat}\pm0.2_{\rm sys})\times10^{-26}e\,{\rm cm}$.
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