Speaker
Prof.
Klaus Kirch
(ETHZ & PSI)
Description
Searches for finite permanent electric dipole moments (EDM) of fundamental systems with spin are among the most sensitive experimental tests of parity and time reversal symmetry. Invoking the CPT theorem, they also test the CP symmetry between matter and antimatter. Values of EDM from various fundamental particles and systems offer complementary information concerning the potential sources of CP violation. They are up to now all consistent with zero and provide stringent limits on physics beyond the standard model of particle physics. The neutron EDM plays a crucial role as the simplest hadronic system. Several efforts are under way aiming at much improved experimental sensitivities. An overview will be presented with a focus on the most sensitive search so far with data from 2015/16 taken by the international nEDM collaboration at PSI. As a first result from this data set, limits have been derived on oscillating EDM with implications for hypothetical ultralight axion dark matter [C. Abel et al., PRX7(2017)041034].
Primary author
Prof.
Klaus Kirch
(ETHZ & PSI)
