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NMSSM Higgs Benchmarks Near 125 GeV

S. F. King, M. Muhlleitner, R. Nevzorov

TL;DR

The paper investigates the NMSSM as a natural alternative to the MSSM for a SM-like Higgs near 125 GeV, emphasizing light stops and gluinos to reduce tuning. It analyzes perturbativity up to the GUT scale and the role of possible extra matter to allow larger λ, presenting four sets of benchmark points (Higgs as H_1 or H_2, with/without extra matter) that realize a 125 GeV Higgs with minimal tuning. By computing Higgs masses, branching ratios, production cross-sections, and relic density constraints using NMSSMTools, NMSSM-HDECAY, and related codes, the work shows that NMSSM can yield both SM-like and distinctly enhanced γγ signals due to singlet mixing and SUSY loop effects. The benchmarks provide concrete targets for LHC searches to distinguish NMSSM from the SM via altered γγ and VV rates, as well as possible light-slepton/chargino or light-stop signatures.

Abstract

The recent LHC indications of a SM-like Higgs boson near 125 GeV are consistent not only with the Standard Model (SM) but also with Supersymmetry (SUSY). However naturalness arguments disfavour the Minimal Supersymmetric Standard Model (MSSM). We consider the Next-to-Minimal Supersymmetric Standard Model (NMSSM) with a SM-like Higgs boson near 125 GeV involving relatively light stops and gluinos below 1 TeV in order to satisfy naturalness requirements. We are careful to ensure that the chosen values of couplings do not become non perturbative below the grand unification (GUT) scale, although we also examine how these limits may be extended by the addition of extra matter to the NMSSM at the two-loop level. We then propose four sets of benchmark points corresponding to the SM-like Higgs boson being the lightest or the second lightest Higgs state in the NMSSM or the NMSSM-with-extra-matter. With the aid of these benchmark points we discuss how the NMSSM Higgs boson near 125 GeV may be distinguished from the SM Higgs boson in future LHC searches.

NMSSM Higgs Benchmarks Near 125 GeV

TL;DR

The paper investigates the NMSSM as a natural alternative to the MSSM for a SM-like Higgs near 125 GeV, emphasizing light stops and gluinos to reduce tuning. It analyzes perturbativity up to the GUT scale and the role of possible extra matter to allow larger λ, presenting four sets of benchmark points (Higgs as H_1 or H_2, with/without extra matter) that realize a 125 GeV Higgs with minimal tuning. By computing Higgs masses, branching ratios, production cross-sections, and relic density constraints using NMSSMTools, NMSSM-HDECAY, and related codes, the work shows that NMSSM can yield both SM-like and distinctly enhanced γγ signals due to singlet mixing and SUSY loop effects. The benchmarks provide concrete targets for LHC searches to distinguish NMSSM from the SM via altered γγ and VV rates, as well as possible light-slepton/chargino or light-stop signatures.

Abstract

The recent LHC indications of a SM-like Higgs boson near 125 GeV are consistent not only with the Standard Model (SM) but also with Supersymmetry (SUSY). However naturalness arguments disfavour the Minimal Supersymmetric Standard Model (MSSM). We consider the Next-to-Minimal Supersymmetric Standard Model (NMSSM) with a SM-like Higgs boson near 125 GeV involving relatively light stops and gluinos below 1 TeV in order to satisfy naturalness requirements. We are careful to ensure that the chosen values of couplings do not become non perturbative below the grand unification (GUT) scale, although we also examine how these limits may be extended by the addition of extra matter to the NMSSM at the two-loop level. We then propose four sets of benchmark points corresponding to the SM-like Higgs boson being the lightest or the second lightest Higgs state in the NMSSM or the NMSSM-with-extra-matter. With the aid of these benchmark points we discuss how the NMSSM Higgs boson near 125 GeV may be distinguished from the SM Higgs boson in future LHC searches.

Paper Structure

This paper contains 16 sections, 42 equations, 1 figure, 9 tables.

Table of Contents

  1. Introduction
  2. The MSSM
  3. The NMSSM
  4. Constraints from Higgs Boson Searches, SUSY Particle Sear-ches and Dark Matter
  5. Higgs boson searches
  6. Constraints from the LHC Searches
  7. NMSSM spectrum and NMSSM Higgs boson branching ratios
  8. Constraints from Dark Matter, Low Energy Observables, LEP and Tevatron
  9. Constraints on SUSY particle masses from the LHC
  10. The benchmark points
  11. NMSSM with Lightest Higgs being SM-like
  12. NMSSM with Second Lightest Higgs being SM-like
  13. NMSSM-with-extra-matter and Second Higgs being SM-like
  14. NMSSM-with-extra-matter and Lightest Higgs being SM-like
  15. Summary and Conclusion
  16. ...and 1 more sections

Figures (1)

  • Figure 1: The contribution of one--loop corrections to Eq. (\ref{['361']}) as a function of the mass of the heaviest stop $m_{\tilde{t}_2}$ for $\tan\beta=10$, $\mu=200\,\hbox{GeV}$, $Q=m_t=165\,\hbox{GeV}$ and $m_{\tilde{t}_1}=300\,\hbox{GeV}$. Here $\Delta_{II}=2\cdot \Delta/M_Z^2$. Solid, dashed--dotted and dashed lines correspond to the mixing angle in the stop sector $\theta_t=0,\pi/8$ and $\pi/4$, respectively.