# Searching for Heavy Charged Higgs Bosons through Top Quark Polarization

## TL;DR

This paper investigates the production of heavy charged Higgs bosons at the LHC within a Two Higgs Doublet Model, focusing on top quark polarization as a key signature for detection and model discrimination.

## Contribution

It introduces a method using top quark polarization and decay distributions to search for and distinguish heavy charged Higgs bosons in 2HDM models at the LHC.

## Key findings

- Top quark polarization is sensitive to the Higgs coupling structure.
- Differential distributions and asymmetries can discriminate models.
- Inclusive rates complement polarization measurements.

## Abstract

We study the production of a heavy charged Higgs boson at the Large Hadron Collider (LHC) in $gb\to H^{-} t$ within a Two Higgs Doublet Model (2HDM). The chiral structure of the $H^{-} t \bar{b}$ 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 Electro-Weak Symmetry Breaking (EWSB). Taking two benchmark models (2HDM type-I and 2HDM type-Y) as an example, we show that inclusive rates, differential distributions as well as forward-backward asymmetries of the top quark's decay products can be used to search for heavy charged Higgs bosons as well as a model discriminators.