Abstract
These proceedings summarize the progress which has been made within the Jülich Electric Dipole Moment Investigations (JEDI) Collaboration on deuteron beam polarimetry for a storage-ring electric-dipole-moment (EDM) measurement. The design of a dedicated EDM polarimeter requires a precise database for optimization purposes. To address this need, a measurement of a deuteron-carbon scattering database has been performed with the forward part of the WASA-at-COSY detector. Preliminary results for vector analyzing powers and unpolarized differential cross sections for different deuteron beam energies are presented.
Highlights
Understanding the origin of the matter-antimatter imbalance in the universe is one of the grand challenges of modern physics
In a storage ring Electric Dipole Moments (EDM) measurement, the beam polarization is measured continuously exploiting the scattering of the beam particles at forward angles on a thick carbon target
It consists of several layers of "pizza-shaped" plastic scintillators, i.e., two layers of the Forward Window Counter (FWC), one layer of the Forward Trigger Hodoscope (FTH), five layers of the Forward Range Hodoscope (FRH), and four planes of the tracking detector — the Forward Proportional Chamber (FPC)
Summary
Understanding the origin of the matter-antimatter imbalance in the universe is one of the grand challenges of modern physics. Predictions given by the Standard Model fail to explain the observed preponderance of matter by orders of magnitude. New sources of CP violation, coming from outside the Standard Model, are needed. They can be seen in Electric Dipole Moments (EDM) of elementary particles. The principle of an EDM measurement for charged particles like protons or deuterons is based on the observation of the time development of the minuscule vertical-polarization buildup of the beam initially polarized along the particle momentum due to the interaction of a finite EDM with the particle-frame radial electric field in the storage ring. The key challenge is a sensitive and efficient determination of the small change of the polarization
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