Search Strategies for Non-Standard Higgs Bosons at Future e^+e^- Colliders

Abstract

Already in the simplest two-Higgs-doublet model with CP violation in the Higgs sector, the $3\times 3$ mixing matrix for the neutral Higgs bosons can substantially modify their couplings, thereby endangering the ``classical'' Higgs search strategies. However, there are sum rules relating Yukawa and Higgs-Z couplings which ensure that the ZZ, $b\anti b$ and $t\anti t$ couplings of a given neutral 2HDM Higgs boson cannot all be simultaneously suppressed. This result implies that any single Higgs boson will be detectable at an e^+e^- collider if the Z+Higgs, $b\anti b+$Higgs {\it and} $t\anti t+$Higgs production channels are all kinematically accessible {\it and} if the integrated luminosity is sufficient. We explore, as a function of Higgs mass, the luminosity required to guarantee Higgs boson detection, and find that for moderate $\tan \beta$ values the needed luminosity is unlikely to be available for all possible mixing scenarios. The additional difficulties for the case when the two-doublet Higgs sector is extended by adding one more singlet are summarized. Implications of the sum rules for Higgs discovery at the Tevatron and LHC are briefly discussed.

16 pages, 4 postscript figures, references added in replacement

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• Physics with e^+e^- Linear Colliders
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• Detecting and Studying Higgs Bosons at a Photon-Photon Collider
• Do precision electroweak constraints guarantee $e^{+}{e}^{-}$ collider discovery of at least one Higgs boson of a two-Higgs-doublet model?
• Probing scalar-pseudoscalar mixing in the CP violating MSSM at high-energy $e^{+}{e}^{-}$ colliders
• Higgs bosons of the NMSSM with explicit CP violation at the ILC
• Theoretical Constraints on Additional Higgs Bosons in Light of the 126 GeV Higgs
• Determining $\tan \beta$ with Neutral and Charged Higgs Bosons at a Future $e^{+}{e}^{-}$ Linear Collider
• Single Charged Higgs production as a probe of CP violation at a Muon Collider
• Top Yukawa coupling measurement with indefinite CP Higgs in $e^{+}{e}^{-}\to t\bar{t}\Phi$
• Neutral Higgs bosons in the MNMSSM with explicit CP violation
• Refining the predictions of supersymmetric CP-violating models: A top-down approach
• e+e- --> nu nu-bar A in the two-Higgs-doublet model
• What Will We Learn If a Higgs Boson is Found?
• Higgs bosons of a supersymmetric $U(1{)}^{\prime }$ model at the ILC