Phenomenology of the constrained NMSSM

2008/11/30 by A. Djouadi, U. Ellwanger, Ulrich Ellwanger +1
Physics and Astronomy · #Black Holes and Theoretical Physics #Dark matter #Gaugino #Grand Unified Theory #Higgs boson #Large Hadron Collider #Lepton #Lightest Supersymmetric Particle #Minimal Supersymmetric Standard Model #Missing energy #Neutralino #Nuclear physics #Parameter space #Particle physics #Particle physics theoretical and experimental studies #Phenomenology (philosophy) #Philosophy #Physics #Quantum Chromodynamics and Particle Interactions #Scalar (mathematics) #Statistics #Supersymmetry #hep-ph

paper · pdf · doi:10.1088/1126-6708/2009/04/031

published as JHEP 0904:031,2009 · 30 pages, 14 figures, references and comments added

arxiv created 2009/01/06 · openalex publication_date 2009/04/07 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We discuss several phenomenological aspects of the fully constrained version of the next-to-minimal supersymmetric extension of the standard model (cNMSSM). Assuming universal boundary conditions at a high energy scale for the soft supersymmetry-breaking gaugino, sfermion and Higgs masses as well as for the trilinear interactions, we find that the model can satisfy all present constraints from colliders and cosmological data on dark matter, B- and muon-physics. The phenomenologically viable region of the parameter space of the cNMSSM can be described by essentially one single parameter as the universal gaugino mass parameter M_1/2, and corresponds to small values for the universal scalar mass m₀. The lightest supersymmetric particle is always a singlino-like neutralino that is almost degenerate with the lightest tau slepton. We study the particle spectrum of the model and its signatures at the LHC, such as possibly long-lived tau sleptons at the end of decay chains, that would distinguish the cNMSSM from the constrained MSSM.

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