Higgs-Higgsino-Gaugino Induced Two Loop Electric Dipole Moments

TL;DR

This paper calculates the complete two-loop contributions to electron and neutron EDMs in the MSSM, highlighting the importance of Higgs-mediated diagrams for understanding CP-violation and related phenomenology.

Contribution

It provides the first comprehensive calculation of Higgs-mediated chargino-neutralino two-loop EDM contributions in the MSSM, including all relevant diagrams.

Findings

Higgs-mediated diagrams can dominate EDM contributions.

W H^\pm and Z A^0 exchange contributions are significant.

Results are crucial for EDM phenomenology and electroweak baryogenesis studies.

Abstract

We compute the complete set of Higgs-mediated chargino-neutralino two-loop contributions to the electric dipole moments (EDMs) of the electron and neutron in the minimal supersymmetric standard model (MSSM). We study the dependence of these contributions on the parameters that govern CP-violation in the MSSM gauge-gaugino-Higgs-Higgsino sector. We find that contributions mediated by the exchange of W H^\pm and Z A^0 pairs, where H^\pm and A^0 are the charged and CP-odd Higgs scalars, respectively, are comparable to or dominate over those mediated by the exchange of neutral gauge bosons and CP-even Higgs scalars. We also emphasize that the result of this complete set of diagrams is essential for the full quantitative study of a number of phenomenological issues, such as electric dipole moment searches and their implications for electroweak baryogenesis.