Masses and Couplings of the Lightest Higgs Bosons in the (M+1)SSM

TL;DR

This paper investigates the upper mass limits of the lightest Higgs bosons in the (M+1)SSM, including two-loop effects, and explores the relationship between their masses and couplings to guide experimental searches.

Contribution

It provides new upper bounds on Higgs masses considering two-loop corrections and the coupling variations in the (M+1)SSM, aiding comprehensive experimental coverage.

Findings

Two-loop contributions reduce Higgs masses by about 10 GeV.

Upper bounds on strongly coupled Higgs masses are established.

Relations between Higgs masses and couplings are detailed.

Abstract

We study the upper limits on the mass of the lightest and second lightest CP even Higgs bosons in the (M+1)SSM, the MSSM extended by a gauge singlet. The dominant two loop contributions to the effective potential are included, which reduce the Higgs masses by 10 GeV. Since the coupling R of the lightest Higgs scalar to gauge bosons can be small, we study in detail the relations between the 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 by Higgs boson searches.