Probing top charged-Higgs production using top polarization at the Large Hadron Collider

TL;DR

This paper investigates how top polarization measurements at the LHC can serve as sensitive probes for detecting charged Higgs bosons in the type II two Higgs doublet model, offering a new approach to explore physics beyond the Standard Model.

Contribution

It introduces a novel method using top polarization and decay lepton angular distributions to distinguish charged Higgs production from Standard Model processes at the LHC.

Findings

Top polarization in charged Higgs production differs significantly from t-W production.

Azimuthal symmetry from decay lepton distribution effectively probes top polarization.

Method can constrain parameters of the charged Higgs production process.

Abstract

We study single top production in association with a charged Higgs in the type II two Higgs doublet model at the Large Hadron Collider. The polarization of the top, reflected in the angular distributions of its decay products, can be a sensitive probe of new physics in its production. We present theoretically expected polarizations of the top for top charged-Higgs production, which is significantly different from that in the closely related process of t-W production in the Standard Model. We then show that an azimuthal symmetry, constructed from the decay lepton angular distribution in the laboratory frame, is a sensitive probe of top polarization and can be used to constrain parameters involved in top charged-Higgs production.