Searching for heavy charged Higgs bosons through top quark polarization

We study the production of a heavy charged Higgs boson at the Large Hadron Collider (LHC) in gb -> H-t within a 2-Higgs Doublet Model (2HDM). The chiral structure of the H+(t) over barb coupling can trigger a particular spin state of the top quark produced in the decay of a charged Higgs boson and, therefore, is sensitive to the underlying mechanism of the Electroweak Symmetry Breaking (EWSB). Taking two benchmark models (2HDM type-I and 2HDM type-Y) as an example, we show that inclusive rates, differential distributions and forward-backward asymmetries of the top quark's decay products can be used to search for heavy charged Higgs bosons and also as model discriminators.