Electric Dipole Moment of Dirac Fermionic Dark Matter

TL;DR

This paper investigates the electric dipole moment of Dirac fermionic dark matter, constraining its magnitude based on current experimental limits and exploring implications for future detection through EDM interactions.

Contribution

It provides the first detailed analysis of EDM constraints on Dirac fermionic dark matter and discusses potential future detection via EDM interactions.

Findings

WIMP EDM constrained to be below 7×10^(-22) e·cm for 100 GeV mass

Current experiments exclude certain EDM values for dark matter detection

Future EDM measurements could enable WIMP discovery through CP violation signals

Abstract

The direct limit of electric dipole moment (EDM) and direct search for dark matter by EDM interaction are considered as including the electromagnetic nuclear form factor, in case that the dark matter candidate is a Dirac particle. The WIMP electric dipole moment constrained by direct searches must be lower than 7*10^(-22)e cm for WIMP mass of 100 GeV to satisfy the current experimental exclusion limits at XENON10 and CDMS II. We also consider the CP violation of EDM and the WIMP discovery by EDM intereaction in the future.