Electric dipole moments and dark matter in a CP violating MSSM

TL;DR

This paper explores how CP-violating phases in a supersymmetric model influence electric dipole moments and dark matter detection, showing current experimental bounds are compatible with certain phase values and predicting future testability.

Contribution

It demonstrates that CP-violating phases of about ten degrees are consistent with current EDM bounds and analyzes their impact on dark matter detection cross sections.

Findings

CP-violating phases of ~10 degrees are compatible with current EDM constraints.

CP phases can alter dark matter-nucleon scattering cross sections significantly.

Future experiments may detect effects of these CP-violating phases.

Abstract

We investigate electric dipole moments (EDMs) in a CP-violating minimal supersymmetric standard model with the Bino-like neutralino dark matter (DM) annihilating through the heavy Higgs funnel. Motivated by the current experimental results, in particular, the measured mass of the standard model-like Higgs boson, we consider a mass spectrum with stop masses of about 10 TeV. For the other sfermions, we consider masses of about 100 TeV. We show that CP-violating phases of the order of ten degrees in gaugino and Higgsino mass parameters are consistent with the current bound by EDMs of the electron, the neutron, and the mercury. They are within the reach of future experiments. We also show that effects of CP-violating phases induce a difference in DM-nucleon scattering cross section by a factor.