Electric Dipole Moments: A Global Analysis

TL;DR

This paper conducts a comprehensive analysis of electric dipole moment searches across various systems to set bounds on CP-violating interactions and explores how future experiments could significantly extend these limits.

Contribution

It provides a global framework translating EDM measurements into bounds on fundamental CP-violating interactions and assesses future experimental potential.

Findings

Lower bounds on new physics scale range from 1.5 TeV to 1300 TeV.

Future measurements could increase the mass reach by over an order of magnitude.

Complementary systems enhance sensitivity to CP-violating parameters.

Abstract

We perform a global analysis of searches for the permanent electric dipole moments (EDMs) of the neutron, neutral atoms, and molecules in terms of six leptonic, semileptonic, and nonleptonic interactions involving photons, electrons, pions, and nucleons. Translating the results into fundamental CP-violating effective interactions through dimension six involving Standard Model particles, we obtain rough lower bounds on the scale of beyond the Standard Model CP-violating interactions ranging from 1.5 TeV for the electron EDM to 1300 TeV for the nuclear spin-independent electron-quark interaction. We show that future measurements involving systems or combinations of systems with complementary sensitivities to the low-energy parameters may extend the mass reach by an order of magnitude or more.