Article

Hyperfine Interactions

, Volume 172, Issue 1, pp 41-43

Towards a new measurement of the neutron electric dipole moment

  • G. BanAffiliated withLaboratoire de Physique Corpusculaire de Caen Email author 
  • , K. BodekAffiliated withJagellonian University
  • , M. DaumAffiliated withPaul Scherrer Institute
  • , R. HenneckAffiliated withPaul Scherrer Institute
  • , S. HeuleAffiliated withPaul Scherrer Institute
  • , M. KasprzakAffiliated withPaul Scherrer Institute
  • , N. KhomytovAffiliated withJoint Institute for Nuclear Research
  • , K. KirchAffiliated withPaul Scherrer Institute
  • , A. KnechtAffiliated withPaul Scherrer Institute
    • , S. KistrynAffiliated withJagellonian University
    • , P. KnowlesAffiliated withUniversity of Fribourg
    • , M. KuzniakAffiliated withJagellonian UniversityPaul Scherrer Institute
    • , T. LefortAffiliated withLaboratoire de Physique Corpusculaire de Caen
    • , O. Naviliat-CuncicAffiliated withLaboratoire de Physique Corpusculaire de Caen
    • , A. PichlmaierAffiliated withPaul Scherrer Institute
    • , C. PlonkaAffiliated withInstitute Laue-Langevin
    • , G. QuémenerAffiliated withLaboratoire de Physique Subatomique et de Cosmologie
    • , M. RebetezAffiliated withUniversity of Fribourg
    • , D. RebreyendAffiliated withLaboratoire de Physique Subatomique et de Cosmologie
    • , G. RogelAffiliated withLaboratoire de Physique Corpusculaire de CaenInstitute Laue-Langevin
    • , B. M. SabirovAffiliated withJoint Institute for Nuclear Research
    • , M. TurAffiliated withLaboratoire de Physique Subatomique et de Cosmologie
    • , A. WeisAffiliated withUniversity of Fribourg
    • , J. ZejmaAffiliated withJagellonian University

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Abstract

Precision measurements of particle electric dipole moments (EDMs) provide extremely sensitive means to search for non-standard mechanisms of T (or CP) violation. For the neutron EDM, the upper limit has been reduced by eight orders of magnitude in 50 years thereby excluding several CP violation scenarios. We report here on a new effort aiming at improving the neutron EDM limit by two orders of magnitude, down to a level of 3 × 10−28 e·cm. The two central elements of the approach are the use of the higher densities which will be available at the new dedicated spallation UCN source at the Paul Scherrer Institute, and the optimization of the in-vacuum Ramsey resonance technique, with storage chambers at room temperature, to reach new limits of sensitivity.

Keywords

CP-violation Electric dipole moment Tests of the standard model