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.
Categories: hep-ph