An Improved Neutron Electric Dipole Moment Experiment

Abstract

A new measurement of the neutron EDM, using Ramsey's method of separated oscillatory fields, is in preparation at the new high intensity source of ultra-cold neutrons (UCN) at the Paul Scherrer Institute, Villigen, Switzerland (PSI). The existence of a non-zero nEDM would violate both parity and time reversal symmetry and, given the CPT theorem, might lead to a discovery of new CP violating mechanisms. Already the current upper limit for the nEDM (|d_n|<2.9E-26 e.cm) constrains some extensions of the Standard Model. The new experiment aims at a two orders of magnitude reduction of the experimental uncertainty, to be achieved mainly by (1) the higher UCN flux provided by the new PSI source, (2) better magnetic field control with improved magnetometry and (3) a double chamber configuration with opposite electric field directions. The first stage of the experiment will use an upgrade of the RAL/Sussex/ILL group's apparatus (which has produced the current best result) moved from Institut Laue-Langevin to PSI. The final accuracy will be achieved in a further step with a new spectrometer, presently in the design phase.

Flavor Physics & CP Violation Conference, Taipei, 2008

References in corpus (2)

• The Neutron EDM in the SM : A Review
• Detailed discussion of a linear electric field frequency shift (important for next generation) electric dipole moment searches) induced in confined gases by a magnetic field gradient: Implications for electric dipole moment experiments (II)

Cited by in corpus (9)

• The Effective Chiral Lagrangian From Dimension-Six Parity and Time-Reversal Violation
• Electric Dipole Moments of Light Nuclei From Chiral Effective Field Theory
• Reevaluation of Neutron Electric Dipole Moment with QCD Sum Rules
• The Electric Dipole Form Factor of the Nucleon in Chiral Perturbation Theory to Sub-leading Order
• The Time-Reversal- and Parity-Violating Nuclear Potential in Chiral Effective Theory
• Neutron Electric Dipole Moment Constraint on Scale of Minimal Left-Right Symmetric Model
• Neutron Electric Dipole Moment Induced by the Strangeness Revisited
• Constraints of chromoelectric dipole moments to natural SUSY type sfermion spectrum
• Test of Symmetries with Neutrons and Nuclei