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The complementarity of LEP, the Tevatron and the LHC in the search for a light MSSM Higgs boson

M. Carena, S. Mrenna, C. E. M. Wagner

TL;DR

This paper analyzes how radiative corrections in the MSSM affect a light Higgs that couples to W and Z, exploring the complementarity of LEP, Tevatron, and LHC in discovering φ_W via bb and γγ channels. By mapping MSSM parameters (notably m_A, tanβ, and SUSY masses) onto collider reach, it shows that parameter regions difficult for one collider are often accessible to another, ensuring broad coverage of the MSSM Higgs sector. Key mechanisms include μ- and A-term induced suppressions or enhancements of the φ_W bb coupling, Δ(m_b) corrections, and the impact of light stops/sbottoms on gg and γγ loops, which shift BRs and production rates. The work highlights practical strategies for securing discovery across the MSSM plane and clarifies how the LHC, with γγ channels, complements LEP/Tevatron bb channels in testing electroweak symmetry breaking.

Abstract

We study the properties of the Higgs boson sector in the MSSM, putting special emphasis on radiative effects which can affect the discovery potential of the LHC, Tevatron and/or LEP colliders. We concentrate on the V b b-bar channel, with V=Z or W, and on the channels with diphoton final states, which are the dominant ones for the search for a light Standard Model Higgs boson at LEP/Tevatron and LHC, respectively. By analyzing the regions of parameter space for which the searches in at least one of these colliders can be particularly difficult, we demonstrate the complementarity of these three colliders in the search for a light Higgs boson which couples in a relevant way to the W and Z gauge bosons (and hence plays a relevant role in the mechanism of electroweak symmetry breaking).

The complementarity of LEP, the Tevatron and the LHC in the search for a light MSSM Higgs boson

TL;DR

This paper analyzes how radiative corrections in the MSSM affect a light Higgs that couples to W and Z, exploring the complementarity of LEP, Tevatron, and LHC in discovering φ_W via bb and γγ channels. By mapping MSSM parameters (notably m_A, tanβ, and SUSY masses) onto collider reach, it shows that parameter regions difficult for one collider are often accessible to another, ensuring broad coverage of the MSSM Higgs sector. Key mechanisms include μ- and A-term induced suppressions or enhancements of the φ_W bb coupling, Δ(m_b) corrections, and the impact of light stops/sbottoms on gg and γγ loops, which shift BRs and production rates. The work highlights practical strategies for securing discovery across the MSSM plane and clarifies how the LHC, with γγ channels, complements LEP/Tevatron bb channels in testing electroweak symmetry breaking.

Abstract

We study the properties of the Higgs boson sector in the MSSM, putting special emphasis on radiative effects which can affect the discovery potential of the LHC, Tevatron and/or LEP colliders. We concentrate on the V b b-bar channel, with V=Z or W, and on the channels with diphoton final states, which are the dominant ones for the search for a light Standard Model Higgs boson at LEP/Tevatron and LHC, respectively. By analyzing the regions of parameter space for which the searches in at least one of these colliders can be particularly difficult, we demonstrate the complementarity of these three colliders in the search for a light Higgs boson which couples in a relevant way to the W and Z gauge bosons (and hence plays a relevant role in the mechanism of electroweak symmetry breaking).

Paper Structure

This paper contains 13 sections, 26 equations, 11 figures.

Table of Contents

  1. Introduction
  2. Higgs searches at present and (near) future colliders
  3. The couplings of the CP-even Higgs bosons
  4. Results
  5. The Minimal Mixing Model
  6. $\phi b\bar{b}$ suppression for large $M_S$
  7. Bottom Yukawa corrections
  8. Cancellations from the sbottom sector
  9. Light stop and large mixing
  10. $\phi b\bar{b}$ coupling suppression for light stops
  11. $\phi b \bar{b}$ coupling enhancement and light third generation squarks.
  12. Conclusions
  13. Relations between the CP even Higgs masses

Figures (11)

  • Figure 1: Sensitivity of the Standard Model Higgs searches at LEP and the Tevatron (for different total integrated luminosity).
  • Figure 2: Discover reach of the LEP, Tevatron and LHC experiments in the minimal mixing model, as defined in the text.
  • Figure 3: Same as Fig. \ref{['minimal']} but for $A_t=-\mu=1.5$ TeV, $M_S=1$ TeV
  • Figure 4: Same as Fig. \ref{['minimal']}, but for $A_t = -\mu = 1$ TeV, and including the effects of the bottom mass corrections, $\Delta(m_b)$, calculated using $M_{\tilde{g}}=-.5$ TeV.
  • Figure 5: Same as Fig. \ref{['deltamb1_neg_mg']}, but for $M_{\tilde{g}}=.5$ TeV.
  • ...and 6 more figures