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 root s = 1.5 TeV. The signal process chain is e(+)e(-) -> Z*/gamma* -> H+H- -> HW+HW- -> b (b) over bar jjb (b) over bar jj. 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-+/-. The value of tan beta is kept relatively high to enhance the branching ratio of H -> b (b) over bar to benefit the signal processes. The main standard model (SM) background process produced is t (t) over bar. 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.