Higgs Mediated EDMs in the Next-to-MSSM: An Application to Electroweak Baryogenesis

TL;DR

This paper investigates the predictions of electric-dipole moments in the NMSSM with CP violation, highlighting the dominance of two-loop Higgs-mediated contributions and their relevance to electroweak baryogenesis.

Contribution

It provides a detailed analysis of EDM predictions in the NMSSM with specific CP phases, emphasizing the importance of two-loop Higgs-mediated effects in baryogenesis.

Findings

Two-loop Higgs-mediated contributions dominate EDM predictions.

Neutralino one-loop contributions are generally small.

Results are relevant for electroweak baryogenesis scenarios.

Abstract

We perform a study on the predictions of electric-dipole moments (EDMs) of neutron, Mercury (Hg), Thallium (Tl), deuteron, and Radium (Ra) in the framework of next-to-minimal supersymmetric standard model (NMSSM) with CP-violating parameters in the superpotential and soft-supersymmetry-breaking sector. We confine to the case in which only the physical tree-level CP phase $(\phi'_\lambda - \phi'_\kappa)$, associated with the couplings of the singlet terms in the superpotential and with the vacuum-expectation-values (VEVs), takes on a nonzero value. We found that the one-loop contributions from neutralinos are mostly small while the two-loop Higgs-mediated contributions of the Barr-Zee (BZ) type diagrams dominate. We emphasize a scenario motivated by electroweak baryogenesis.