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Related Experiment Video

Updated: Jun 29, 2026

Setting Limits on Supersymmetry Using Simplified Models
07:46

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

Constrained next-to-minimal supersymmetric standard model.

A Djouadi1, U Ellwanger, A M Teixeira

  • 1Laboratoire de Physique Théorique, Université Paris-Sud and CNRS, F-91405 Orsay, France.

Physical Review Letters
|October 15, 2008
PubMed
Summary

The constrained Next-to-Minimal Supersymmetric Standard Model (cNMSSM) is more restricted than minimal supergravity models. A small universal scalar mass allows a single parameter to define cNMSSM phenomenology under collider and cosmological constraints.

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Area of Science:

  • High Energy Physics
  • Theoretical Physics
  • Particle Physics

Background:

  • The Standard Model (SM) is the current framework for particle physics.
  • Supersymmetry (SUSY) offers solutions to the SM's limitations.
  • The Next-to-Minimal Supersymmetric Standard Model (NMSSM) extends the Minimal Supersymmetric Standard Model (MSSM) by adding a singlet Higgs superfield.

Purpose of the Study:

  • To investigate the phenomenological viability of the fully constrained Next-to-Minimal Supersymmetric Standard Model (cNMSSM).
  • To determine the constraints on the cNMSSM parameter space from collider and cosmological data.
  • To compare the cNMSSM with the Minimal Supergravity (mSUGRA) model.

Main Methods:

  • The study considers the cNMSSM with universal boundary conditions for soft supersymmetry-breaking parameters at a high energy scale.
  • Phenomenological viability is assessed by imposing constraints from collider experiments and cosmological observations.
  • The parameter space is explored to identify regions consistent with experimental and cosmological data.

Main Results:

  • The cNMSSM is found to be more constrained than the mSUGRA model.
  • Phenomenologically viable regions in the cNMSSM parameter space require a small universal scalar mass (m₀).
  • In these viable regions, a single input parameter can describe the model's phenomenology.

Conclusions:

  • The cNMSSM provides a more restricted theoretical framework compared to mSUGRA.
  • The model's phenomenology is highly sensitive to the value of the universal scalar mass m₀.
  • Under current constraints, the cNMSSM can be effectively described by a minimal set of parameters.