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The Constrained NMSSM with right-handed neutrinos.

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Adding right-handed neutrinos to the Next-to-Minimal Supersymmetric Standard Model (NMSSM) resolves issues with parameter universality and Higgs mass. This model simplifies electroweak symmetry breaking but may require entropy production to manage relic density.

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Area of Science:

  • High Energy Physics
  • Particle Physics
  • Supersymmetry

Background:

  • The Next-to-Minimal Supersymmetric Standard Model (NMSSM) faces challenges with parameter universality and Higgs mass constraints.
  • Existing models often struggle to reconcile theoretical predictions with experimental observations.

Purpose of the Study:

  • To investigate the impact of incorporating right-handed neutrino superfields into the NMSSM.
  • To explore the alleviation of problems in the Constrained NMSSM by imposing Grand Unification scale universality.
  • To analyze the effects on electroweak symmetry breaking and Higgs mass.

Main Methods:

  • Renormalization group equations were studied for the proposed model.
  • The influence of right-handed neutrinos on Higgs mass-squared parameters was analyzed.
  • Model predictions were compared against collider and low-energy observable bounds.

Main Results:

  • Inclusion of right-handed neutrinos facilitates universality conditions at the Grand Unification scale.
  • Right-handed neutrinos drive the singlet Higgs mass-squared parameter negative, aiding radiative electroweak symmetry breaking.
  • Larger Standard Model Higgs masses are predicted, aligning better with measured values.
  • The model satisfies collider and low-energy bounds across extensive parameter spaces.

Conclusions:

  • The extended NMSSM with right-handed neutrinos offers a viable framework for supersymmetry.
  • While resolving key issues, the model necessitates mechanisms like late entropy production to address potential overproduction of the lightest supersymmetric particle.
  • This framework enhances the consistency of the NMSSM with current experimental data.