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

The observability of charged Higgs bosons H^± has been investigated at future lepton collider in type I two-Higgs- doublet model (2HDM) at the center of mass energy √(s)=1.5 TeV. The signal process chain is e^+e^-→ Z^*/ γ ^*→ H^+ H^-→ H W^+ H W^-→ b b j j b b j j . The process proceeds through virtual γ 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^± . The value of tanβ is kept relatively high to enhance the branching ratio of H→ bb to benefit the signal processes. The main standard model (SM) background process produced is tt . 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^± 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.