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In singlet extensions of the two Higgs doublet model, a light CP-odd Higgsboson (A) can significantly modify decay modes of the charged Higgs, withoutnecessarily affecting decay modes of the standard model-like Higgs boson. Theseeffects can be sizable even if the doublet component of the light CP-odd Higgsis small, so that constraints from Upsilon decays and direct CP-odd Higgsproduction do not apply. We study a scenario in which the charged Higgs isproduced in top quark decays, t -> H+ b, with dominant H+ -> W A. We focus onthe CP-odd Higgs mass range below the bb threshold. We summarize all currentexperimental 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+, andCP-odd Higgs doublet component. We discuss search strategies based on A -> tautau, 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 20fb^-1 of 8 TeV LHC data can constrain most of the currently allowed parameterspace. Existing trilepton searches are not sensitive to this signal due to theadopted isolation criteria.

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