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Pair production of Higgs bosons associated with $Z$ boson in the left-right twin Higgs model at the ILC

The left-right twin Higgs(LRTH) model predicts the existence of three additional Higgs bosons: one neutral Higgs $ϕ^{0}$ and a pair of charged Higgs bosons $ϕ^{\pm}$. In this paper, we studied the production of a pair of charged and neutral Higgs bosons associated with standard model gauge boson $Z$ at the ILC, i.e., $e^{+}e^{-}\rightarrow Zϕ^{+}ϕ^{-}$ and $e^{+}e^{-}\rightarrow Zϕ^{0}ϕ^{0}$. We calculate the production rate and present the distributions of the various observables, such as, the distributions of the energy and the transverse momenta of final $Z$-boson and charged Higgs boson $ϕ^{-}$, the differential cross section of the invariant mass of charged Higgs bosons pair, the distribution of the angle between charged Higgs bosons pair and the production angle distributions of $Z$-boson and charged Higgs boson $ϕ^{-}$. Our numerical results show that, for the process $e^{+}e^{-}\rightarrow Zϕ^{+}ϕ^{-}$, the production rates are at the level of $10^{-1} fb$ with reasonable parameter values. For the process of $e^{+}e^{-}\rightarrow Zϕ^{0}ϕ^{0}$, we find that the production cross section are smaller than $6\times 10^{-3} fb$ in most of parameter space. However, the resonance production cross section can be significantly enhanced.