Singlino-driven Electroweak Baryogenesis in the Next-to-MSSM

TL;DR

This paper investigates how the singlino in the next-to-minimal supersymmetric standard model can drive electroweak baryogenesis, producing the observed matter-antimatter asymmetry without conflicting with current electric dipole moment constraints.

Contribution

It introduces a novel mechanism where the singlino's CP violation facilitates baryogenesis within the NMSSM framework, analyzed using the closed-time-path formalism.

Findings

Singlino can generate sufficient CP violation for baryogenesis.

The model is consistent with current electric dipole moment constraints.

A strong first-order electroweak phase transition is achievable.

Abstract

We explore a new possibility of electroweak baryogenesis in the next-to-minimal supersymmetric standard model. In this model, a strong first-order electroweak phase transition can be achieved due to the additional singlet Higgs field. The new impact of its superpartner (singlino) on the baryon asymmetry is investigated by employing the closed-time-path formalism. We find that the CP violating source term fueled by the singlino could be large enough to generate the observed baryon asymmetry of the Universe without any conflicts with the current constraints from the non-observation of the Thallium, neutron and Mercury electric dipole moments.