Electroweak Phase Transition in a Right-Handed Neutrino Superfield Extended NMSSM

TL;DR

This paper investigates the electroweak phase transition and gravitational wave production in an extended NMSSM model with a right-handed neutrino superfield, highlighting conditions for a first-order transition relevant to baryogenesis and detectable gravitational waves.

Contribution

It introduces a novel analysis of phase transition dynamics in an extended NMSSM with a right-handed neutrino, emphasizing the role of new parameters and sneutrino states.

Findings

First-order phase transition favors right-handed sneutrino below 125 GeV.

Model predicts gravitational waves detectable by future space-based interferometers.

Provides alternative probes for physics beyond the Standard Model.

Abstract

Supersymmetric models with singlet extensions can accommodate single- or multi-step first-order phase transitions (FOPT) along the various constituent field directions. Such a framework can also produce Gravitational Waves, detectable at the upcoming space-based interferometers, e.g., U-DECIGO. We explore the dynamics of electroweak phase transition and the production of Gravitational Waves in an extended set-up of the Next-to-Minimal Supersymmetric Standard Model (NMSSM) with a Standard Model singlet right-handed neutrino superfield. We examine the role of the new parameters compared to NMSSM on the phase transition dynamics and observe that the occurrence of a FOPT, an essential requirement for Electroweak Baryogenesis, typically favours a right-handed sneutrino state below 125 GeV. Our investigation shows how the analysis can offer complementary probes for physics beyond the Standard Model besides the collider searches.