29.01.15 16:00

Spin Physics with COSY

F. Rathmann (FZ Jülich)

In the upcoming period from 2015 to 2019 experimental investigations at
COSY will primarily focus on the search for electric dipole moments of charged
hadrons, i.e., proton and deuteron.
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 searched for by (i) employing highest energies (e.g., at LHC),
and (ii) striving for ultimate precision and sensitivity (e.g., in the search for elec-
tric dipole moments (EDMs)). Permanent EDMs of particles violate both time
reversal (T ) and parity (P ) invariance, and are via the CP T -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 correspond-
ing theoretical model, e.g., SUSY. Direct searches of proton and deuteron EDMs
bear the potential to reach sensitivities beyond 10 −29 e·cm, and are considered
must-do experiments. For an all-electric proton storage ring, this goal is pur-
sued by the US-based srEDM collaboration, while the newly found Jülich-based
JEDI collaboration is pursuing an approach using a combined electric-magnetic
lattice which shall allow access to protons, deuterons, and 3 He ions in the same
machine. In addition, JEDI has proposed an experiment for COSY based on a rf
Wien filter with horizontal electric field.
The research environment at Jülich coupled to the strong experienced groups
of scientists and engineers from Jülich, RWTH-Aachen, Brookhaven National
Lab, Ferrara University, and many other institutions, provides an ideal starting
point for charged particle EDM searches. The talk will emphasize one of the
most spectacular possibilities in modern science: Finding a signal for new physics
beyond the Standard Model through the detection of permanent electric dipole
moments in a storage ring

Kategorie: Kolloquium