Charged Higgs Observability via Charged Higgs Pair Production at Future Lepton Collider

TL;DR

This paper investigates the potential to observe charged Higgs bosons at a future lepton collider through pair production, analyzing signal and background processes to determine discovery prospects within the type-I 2HDM framework.

Contribution

It presents a detailed simulation study of charged Higgs pair production at a 1.5 TeV lepton collider, including event reconstruction and significance analysis for the first time in this context.

Findings

Charged Higgs bosons can be potentially discovered via pair production.

Mass reconstruction of charged Higgs bosons is feasible with the proposed method.

Significance analysis shows promising detection prospects at given luminosities.

Abstract

The observability of charged Higgs $ H^{\pm} $ has been investigated at future lepton collider by assuming type-I 2HDM, at a centre of mass energy $ \sqrt{s}=1.5$ TeV. The signal process chain is $ e^{+}e^{-} \rightarrow Z^{*}/ \gamma^{*}\rightarrow H^{+} H^{-}\rightarrow H W^{+} H W^{-}\rightarrow b \overline{b} jjb \overline{b} jj$. The process proceed through virtual gamma and Z-boson exchange in S-channel. Several benchmark points are selected and events are analyzed to reconstruct the mass of charged Higgs bosons $ H^{\pm} $. The value of $\tan\beta $ is kept relatively high to enhance the branching ratio of $ H\rightarrow b\overline{b} $ to benefit the signal processes. The main SM background processes produced is $ t\overline{t} $. Signal selection and significance efficiencies are calculated at integrated luminosities of $100 fb^{-1} $ and $ 500 fb^{-1} $. The reconstructed and corrected mass of charged Higgs bosons $ H^{\pm} $ is determined. Through analyzing the results, it is demonstrated that charged Higgs bosons can be discovered through pair production process via its bosonic decays. This study is supposed to provide the experimentalists a good way to examine the Higgs bosons beyond SM, as well as to check the validity of 2HDM models in considered parameter space.