The constrained next-to-minimal supersymmetric standard model

TL;DR

This paper analyzes the fully constrained next-to-minimal supersymmetric standard model (cNMSSM), highlighting its predictive power, constrained parameter space, and distinctive particle spectrum compared to the MSSM, under universal boundary conditions.

Contribution

It introduces a fully constrained version of the NMSSM with universal boundary conditions, showing its increased predictability and distinct phenomenology from the MSSM.

Findings

Model is more constrained than mSUGRA.

Viable parameter space has small scalar mass m_0.

Single parameter describes phenomenology under constraints.

Abstract

We consider the fully constrained version of the next-to-minimal supersymmetric extension of the standard model (cNMSSM) in which a singlet Higgs superfield is added to the two doublets that are present in the minimal extension (MSSM). Assuming universal boundary conditions at a high scale for the soft supersymmetry-breaking gaugino, sfermion and Higgs mass parameters as well as for the trilinear interactions, we find that the model is more constrained than the celebrated minimal supergravity model. The phenomenologically viable region in the parameter space of the cNMSSM corresponds to a small value for the universal scalar mass m_0: in this case, one single input parameter is sufficient to describe the phenomenology of the model once the available constraints from collider data and cosmology are imposed. We present the particle spectrum of this very predictive model and discuss how it can be distinguished from the MSSM.