Abstract
We study 4b + 2τ and 4b + 1τ signatures of heavy neutral and charged Higgs bosons originating from cascade decays of pair-produced new quarks. Decays of vectorlike quarks through heavy Higgses can easily dominate in the two Higgs doublet model of type-II, and the studied signatures are common to many possible decay chains. We design search strategies for these final states and discuss the mass ranges of heavy Higgs bosons and new quarks that can be explored at the Large Hadron Collider as functions of branching ratios in a model independent way. We further combine the results with a similar study focusing on decays which lead to a 6b final state and interpret the sensitivity to charged and neutral Higgs bosons and vectorlike quarks in the type-II two Higgs doublet model. We find that the LHC reach for their masses extends to well above 2 TeV in the case of an SU(2) doublet quark and to at least 1.8 TeV for a bottom-like SU(2) singlet quark in the whole range of tan β between 1 and 50.
Highlights
In this paper we present analyses based on final states where one of the heavy neutral or charged Higgs bosons decays to tau leptons, see figure 1
We present search strategies for 4b + 2τ and 4b + 1τ signatures which are common to several possible decay chains involving both top and bottom quarks in final states and discuss the mass ranges of heavy Higgs bosons and new quarks that can be explored at the LHC as functions of branching ratios (BRs) in a model independent way
The absence of a signal for lower quark masses can be interpreted as an upper limit on the branching ratio of a new quark to heavy Higgses
Summary
The 4b + 2τ and 4b + 1τ final states can be produced with large rates from cascade decays of new quarks through heavy Higgs bosons. Note that doublet-like b4 and t4 can have large BRs to one of the neutral or charged Higgs bosons at any tan β. Doublet-like b4 and t4 dominantly decay to the charged Higgs in a different region of tan β than to neutral Higgses. Large BRs of heavy neutral Higgses to bottom quarks require medium to large tan β For projected sensitivities at the HL-LHC we take BR(H/A → bb) = BR(H+ → tb) = 90% and BR(H/A → τ +τ −) = BR(H+ → τ +ντ ) = 10% motivated by type-II 2HDM at large tan β, the sensitivities can be straightforwardly reinterpreted for any other pattern of BRs. The combination of tan β dependences of BRs of new quarks and heavy Higgses identifies processes shown in figure 1 as the most promising within the type-II 2HDM. The search strategies discussed in following sections are not limited to the 2HDM
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