# Charged Higgs production from polarized top-quark decay in the 2HDM considering the general-mass variable-flavor-number scheme

## TL;DR

This paper proposes a new indirect method to search for charged Higgs bosons via polarized top-quark decay, providing analytical ${
m O}(\a_s)$ corrections in the GM-VFNS scheme, especially relevant for the Type-II 2HDM scenario.

## Contribution

It introduces an analytical expression for the B-hadron energy spectrum in polarized top decay with a massive b-quark, enhancing predictions within the 2HDM framework.

## Key findings

- Most reliable predictions are in the GM-VFN scheme.
- Analytical ${
m O}(\a_s)$ corrections are derived for the decay process.
- The method is particularly applicable to the Type-II 2HDM scenario.

## Abstract

Charged Higgs bosons $H^\pm$ are predicted by some non-minimal Higgs scenarios, such as models containing Higgs triplets and two-Higgs-doublet models, so that the experimental observation of these bosons would indicate physics beyond the Standard Model. In the present work, we introduce a new channel to indirect search for the charged Higgses through the hadronic decay of polarized top quarks where a top quark decays into a charged Higgs $H^+$ and a bottom-flavored hadron $B$ via the hadronization process of the produced bottom quark, $t(\uparrow)\rightarrow H^++b(\to B+jet)$. To obtain the energy spectrum of produced $B$-hadrons we present, for the first time, an analytical expression for the ${\cal O}(\alpha_s)$ corrections to the differential decay width of the process $t\rightarrow H^+b$ in the presence of a massive b-quark in the General-Mass Variable-Flavor-Number Scheme (GM-VFNS). We find that the most reliable predictions for the B-hadron energy spectrum are made in the GM-VFN scheme, specifically, when the Type-II 2HDM scenario is concerned.