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

Understand

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.