The Search for Electric Dipole Moments of Charged Particles in Storage Rings

TL;DR

This paper discusses the potential of storage ring experiments to measure electric dipole moments of charged particles, which could reveal new sources of CP violation beyond the Standard Model.

Contribution

It presents recent results from EDM research at COSY and highlights the use of polarized beams in storage rings for direct EDM measurements.

Findings

First direct measurement of deuteron EDM at COSY

Polarized beams enable sensitive EDM detection

Results contribute to understanding CP violation

Abstract

The matter-antimatter asymmetry cannot be explained by the Standard Model (SM) of elementary particle physics. According to A. Sakharov, additional sources of $\mathcal{CP}$-Violating phenomena are needed to understand the matter-antimatter asymmetry. Electric Dipole Moments (EDMs) of subatomic elementary particles may provide additional $\mathcal{CP}$ violation, since they violate $\mathcal{T}$ (and $\mathcal{P}$) symmetry. Polarized beams in storage rings offer the possibility to measure EDMs of charged particles by observing the influence of the EDM on the spin motion. The Cooler Synchrotron (COSY) at Forschungszentrum J\"ulich provides polarized protons and deuterons up to a momentum of 3.7 GeV/c and is therefore an ideal starting point for the JEDI - Collaboration (J\"ulich Electric Dipole moment Investigations) to perform the first direct measurement of the deuteron EDM. This document describes recent results of EDM activities at COSY.