Higgs masses and couplings in the NMSSM

TL;DR

This paper establishes upper bounds on the masses of the lightest Higgs bosons in the NMSSM, considering two-loop corrections and the Higgs-gauge boson coupling variations, to comprehensively cover the model's parameter space.

Contribution

It provides detailed upper bounds on Higgs masses in the NMSSM, including the effects of two-loop corrections and varying Higgs couplings, enhancing understanding of the model's phenomenology.

Findings

Upper bounds on the lightest Higgs masses are derived.

The relation between Higgs masses and their gauge couplings is analyzed.

Parameter space coverage is achieved considering different coupling scenarios.

Abstract

We give the upper bounds on the masses of the lightest and second lightest CP even Higgs bosons in the NMSSM, the MSSM extended by a gauge singlet. The dominant two loop corrections are included. Since the coupling R of the lightest Higgs scalar to gauge bosons can be small, we study in detail the relation between masses and couplings of both lightest scalars. We present upper bounds on the mass of a 'strongly' coupled Higgs (R>1/2) as a function of lower experimental limits on the mass of a 'weakly' coupled Higgs (R<1/2). With the help of these results, the whole parameter space of the model can be covered.