Abstract
Searches for permanent electric dipole moments of fundamental particles and systems with spin are the experiments most sensitive to new CP violating physics and a top priority of a growing international community. We briefly review the current status of the field emphasizing on the charged leptons and lightest baryons.
Highlights
The discovery of a permanent electric dipole moment of a particle would be an unambiguous signal of the violation of parity (P) and time reversal (T) symmetries [1,2,3]
Invoking the CPT theorem [4] it would indicate the violation of the combined symmetry of charge and parity (CP)
At the current level of experimental sensitivity this would in turn manifest new physics; either as the first measurement of CP-violation (CPV) in the strong sector, described by the θ-term [5] of quantum chromo dynamics (QCD) of the standard model (SM), or as manifestation of CPV which is naturally part of many beyond SM (BSM) theories
Summary
The discovery of a permanent electric dipole moment of a particle would be an unambiguous signal of the violation of parity (P) and time reversal (T) symmetries [1,2,3]. At the current level of experimental sensitivity this would in turn manifest new physics; either as the first measurement of CP-violation (CPV) in the strong sector, described by the θ-term [5] of quantum chromo dynamics (QCD) of the standard model (SM), or as manifestation of CPV which is naturally part of many beyond SM (BSM) theories. Searches for electric dipole moments constitute a very powerful tool in the quest to find new physics, complementary to e.g. direct searches at the LHC and other future high energy colliders.
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