Charged Higgs observability via charged Higgs pair production at future lepton collider

Abstract

The observability of charged Higgs bosons $H^{\pm }$ has been investigated at future lepton collider in type I two-Higgs- doublet model (2HDM) at the center of mass energy $\sqrt{s}=1.5$ TeV. The signal process chain is $e^{+}e^{-} \rightarrow Z^{*}/ \gamma ^{*}\rightarrow H^{+} H^{-}\rightarrow H W^{+} H W^{-}\rightarrow b {\overline{b}} j j b {\overline{b}} j j$. The process proceeds through virtual $\gamma$ and Z boson exchange in the 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 standard model (SM) background process produced is $t{\overline{t}}$. Signal selection and significance efficiencies are calculated at integrated luminosities of 100 fb$^{-1}$ , 500 fb$^{-1}$, 1000 fb$^{-1}$, and 5000 fb$^{-1}$. The reconstructed and corrected mass of charged Higgs bosons $H^{\pm }$ is determined. Analyzing the results demonstrates that charged Higgs bosons can be discovered through the pair production process via its bosonic decays. This study is supposed to provide the experimentalists with a good way to examine the Higgs bosons beyond SM and to check the validity of 2HDM models in considered parameter space.