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Investigation of the Discovery Potential for Higgs Bosons of the Minimal Supersymmetric Extension of the Standard Model (MSSM) with ATLAS

Markus Schumacher

TL;DR

This study assesses ATLAS’s discovery reach for Higgs bosons in the MSSM across CPC and CPV benchmark scenarios, using radiative-corrected masses and couplings from FeynHiggs and LO production cross sections corrected to MSSM values. It demonstrates strong discovery potential for the light Higgs $h$ in CPC benchmarks across 30 and 300 fb$^{-1}$, with VBF and multiple channels enabling mass and coupling measurements that could distinguish the MSSM from the SM, while identifying regions where heavy Higgses and CP-violating scenarios remain challenging, notably in CPX at low $M_{H^{\pm}}$ and small $\tan\beta$. The analysis highlights the importance of diverse channels (e.g., $h\to\tau\tau$, $\gamma\gamma$, $ZZ\to4\ell$, $tth$, and $b$-associated production) and outlines a discriminant based on the ratio $R=BR(h\to\tau\tau)/BR(h\to WW)$ to separate MSSM from SM expectations. It also points to the need for additional MC studies in CPX to determine whether the remaining uncovered regions can be probed at the LHC, guiding future experimental efforts.

Abstract

The discovery potential of the ATLAS experiment at the LHC for Higgs bosons of the MSSM is discussed. Several CP conserving and one CP violating benchmark scenario are investigated.

Investigation of the Discovery Potential for Higgs Bosons of the Minimal Supersymmetric Extension of the Standard Model (MSSM) with ATLAS

TL;DR

This study assesses ATLAS’s discovery reach for Higgs bosons in the MSSM across CPC and CPV benchmark scenarios, using radiative-corrected masses and couplings from FeynHiggs and LO production cross sections corrected to MSSM values. It demonstrates strong discovery potential for the light Higgs in CPC benchmarks across 30 and 300 fb, with VBF and multiple channels enabling mass and coupling measurements that could distinguish the MSSM from the SM, while identifying regions where heavy Higgses and CP-violating scenarios remain challenging, notably in CPX at low and small . The analysis highlights the importance of diverse channels (e.g., , , , , and -associated production) and outlines a discriminant based on the ratio to separate MSSM from SM expectations. It also points to the need for additional MC studies in CPX to determine whether the remaining uncovered regions can be probed at the LHC, guiding future experimental efforts.

Abstract

The discovery potential of the ATLAS experiment at the LHC for Higgs bosons of the MSSM is discussed. Several CP conserving and one CP violating benchmark scenario are investigated.

Paper Structure

This paper contains 6 sections, 4 figures.

Table of Contents

  1. The Higgs sector of the MSSM and Benchmark Scenarios
  2. Technicalities
  3. Discovery Potential in the CPC benchmark scenarios
  4. Discovery Potenital in the CPX benchmark scenario
  5. Conclusions
  6. Acknowledgements

Figures (4)

  • Figure 1: Discovery potential for the light CP-even Higgs boson in the CPC benchmark scenarios after collecting 30 fb$^{-1}$. The cross hatched area is excluded by LEP at 95% CL.
  • Figure 2: Discovery potenital for the light CP-even Higgs boson in the CPC benchmark scenarios after collecting 300 fb$^{-1}$. The cross hatched area is excluded by LEP at 95% CL.
  • Figure 3: Left: overall discovery potential for Higgs bosons in the $m_{\mathrm{h}}{\mathrm{-max}}$ scenario after collecting 300 fb$^{-1}$. The cross hatched area is excluded by LEP at 95% CL. Right: sensitivty for discrimination between SM and MSSM from the measurement of $\Delta$ (see text) in the $m_{\mathrm{h}}{\mathrm{-max}}$ scenario.
  • Figure 4: Left: discovery potential for the lightest Higgs boson in the CPX scenario after collecting 300 fb$^{-1}$. The cross hatched area is excluded by LEP at 95% CL. Right: overall discovery potential for Higgs bosons in the CPX scenario after collecting 300 fb$^{-1}$.