Precursor Experiments to Search for Permanent Electric Dipole Moments (EDMs) of Protons and Deuterons at COSY

TL;DR

This paper discusses experimental approaches at COSY to detect permanent electric dipole moments in protons and deuterons, emphasizing the use of a radio-frequency electric field flipper and the importance of spin-coherence time.

Contribution

It introduces a novel experimental setup using a radio-frequency electric field flipper and provides analytic evaluations of spin-coherence times, highlighting a significant increase for deuterons.

Findings

Deuterons have a spin-coherence time about 200 times longer than protons.

Estimated spin-coherence time for deuterons at COSY is approximately 10,000 seconds.

The proposed method could enhance the sensitivity of EDM searches.

Abstract

In this presentation we discuss a number of experiments on the search for proton or deuteron EDMs, which could be carried out at COSY-Juelich. Most promising is the use of an radio-frequency radial electric field flipper that would lead to the accumulation of a CP violating in-plane beam polarization by tiny spin rotations. Most crucial for storage ring searches for EDMs is the spin-coherence time, and we report on analytic evaluations which point at a much larger spin-coherence time for deuterons by about a factor of 200 compared to the one for protons, and at COSY, the spin coherence time for deuterons could amount to about 10 000 s.