Speakers
Description
The Standard Model (SM) of Particle Physics is not capable to account for the apparent
matter-antimatter asymmetry of our Universe. Physics beyond the SM is required and is either
probed by employing highest energies (e.g., at LHC), or by striving for ultimate precision and
sensitivity (e.g., in the search for electric dipole moments). Permanent electric dipole moments
(EDMs) of particles violate both time reversal (T) and parity (P) invariance, and are via the
CPT-theorem also CP-violating. Finding an EDM would be a strong indication for physics
beyond the SM, and pushing upper limits further provides crucial tests for any corresponding
theoretical model, e.g., SUSY.
Up to now, EDM searches focused on neutral systems (neutrons, atoms, and molecules).
Storage rings, however, o?er the possibility to measure EDMs of charged particles by observing
the in
uence of the EDM on the spin motion in the ring [1, 2, 3]. Direct searches of proton
and deuteron EDMs bear the potential to reach sensitivities beyond 10E-29 e cm. Since the
Cooler Synchrotron COSY at the Forschungszentrum Julich provides polarized protons and
deuterons up to momenta of 3.7 GeV/c, it constitutes an ideal testing ground and starting
point for such an experimental program.
The collaboration is presently aiming at a ?rst direct (precursor) measurement of the
deuteron EDM in COSY[4], using an RF Wien ?lter that was speci?cally designed for that
purpose [5, 6, 7]. Beyond that, the technical design of a prototype EDM storage ring [8]
constitutes the next major milestone of the JEDI research program, which shall be addressed
together with CERN in the framework of a newly formed CPEDM collaboration1.
The talk will present the JEDI plans for the measurement of charged hadron EDMs, and
discuss the various technical developments, and also show recent results.
