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

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 $e^{+}{e}^{-}\to Z^{\ast }/{\gamma }^{\ast }\to H^{+}{H}^{-}\to H{W}^{+}H{W}^{-}\to b\overline{b}jjb\overline{b}jj$. 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 $H\to b\overline{b}$ 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 $100f{b}^{-1}$ and $500f{b}^{-1}$. 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.

Comments: 22 pages, 16 figures, 9 tables