Perturbative Unitarity Constraints on the NMSSM Higgs Sector

TL;DR

This paper applies perturbative unitarity constraints to the NMSSM Higgs sector, deriving upper bounds on particle masses and proposing a method to predict the scale of new physics beyond naturalness arguments.

Contribution

It introduces a novel approach using perturbative unitarity to set bounds on NMSSM parameters, replacing traditional naturalness criteria.

Findings

Upper bounds of 20 TeV for heavy Higgses and 12 TeV for charginos/neutralinos with 41% correction limit.

Bounds of 7 TeV for heavy Higgses and 5 TeV for charginos/neutralinos with 20% correction limit.

Methodology to estimate new physics scale using unitarity constraints in supersymmetric models.

Abstract

We place perturbative unitarity constraints on both the dimensionful and dimensionless parameters in the Next-to-Minimal Supersymmetric Standard Model (NMSSM) Higgs Sector. These constraints, plus the requirement that the singlino and/or Higgsino constitutes at least part of the observed dark matter relic abundance, generate upper bounds on the Higgs, neutralino and chargino mass spectrum. Requiring higher order corrections to be no more than 41% of the tree-level value, we obtain an upper bound of 20 TeV for the heavy Higgses and 12 TeV for the charginos and neutralinos outside defined fine-tuned regions. If the corrections are no more than 20% of the tree-level value, the bounds are 7 TeV for the heavy Higgses and 5 TeV for the charginos and neutralinos. In all, by using the NMSSM as a template, we describe a method which replaces naturalness arguments with more rigorous perturbative unitarity arguments to get a better understanding of when new physics will appear.