Trilepton Signatures of Light Charged and CP-odd Higgs Bosons in Top Quark Decays

Abstract

In singlet extensions of the two Higgs doublet model, a light CP-odd Higgs boson (A) can significantly modify decay modes of the charged Higgs, without necessarily affecting decay modes of the standard model-like Higgs boson. These effects can be sizable even if the doublet component of the light CP-odd Higgs is small, so that constraints from Upsilon decays and direct CP-odd Higgs production do not apply. We study a scenario in which the charged Higgs is produced in top quark decays, t -> H+ b, with dominant H+ -> W A. We focus on the CP-odd Higgs mass range below the bb threshold. We summarize all current experimental constraints and find that, as a result of H+ -> W A dominance, this scenario is not constrained in a large region of tan(beta), mH+, and CP-odd Higgs doublet component. We discuss search strategies based on A -> tau tau, with both taus decaying leptonically, and on the subleading decay mode A -> mu mu. We show that a search for t -> H+ b, H+ -> W A, A -> mu mu in 20 fb^-1 of 8 TeV LHC data can constrain most of the currently allowed parameter space. Existing trilepton searches are not sensitive to this signal due to the adopted isolation criteria.

42 pages, 15 figures

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• Comprehensive study of the light charged Higgs boson in the type-I two-Higgs-doublet model
• A New Avenue to Charged Higgs Discovery in Multi-Higgs Models
• Same-sign Charged Higgs Pair Production in bosonic decay channels at the HL-LHC and HE-LHC
• Seeking the CP-odd Higgs via $h\to {\eta }_{c,b}{\ell }^{+}{\ell }^{-}$