Speaker
Prof.
Joerg Pretz
(RWTH Aachen)
Description
Permanent Electric Dipole Moments (EDMs) of fundamental particles violate
both time invariance and parity. Assuming the CPT theorem, this implies
CP violation. The CP violation of the Standard Model is
orders of magnitude too small to be observed experimentally
in EDMs in the foreseeable future. It is also way too small
to explain the asymmetry in abundance of matter and anti-mattter
in our universe.
Hence, other mechanisms outside the realm of the Standard Model
are searched for and could result in measurable EDMs.
EDM experiments with charged hadrons are proposed at storage rings
where polarized particles are exposed to an electric field.
If an electric dipole moment exists the spin vector will experience a torque
resulting in a change of the original spin direction which can be
determined with the help of a polarimeter.
Although the principle of the measurement is simple,
the smallness of the expected effect makes this a challenging experiment
requiring new developments in various experimental areas.
Complementary efforts to measure EDMs of proton, deuteron and light nuclei are
pursued at Brookhaven National Laboratory and at
Forschungszentrum J\"ulich with with an ultimate
goal to reach a sensitivity of $10^{-29}e\cdot$cm.
Primary author
Prof.
Joerg Pretz
(RWTH Aachen)