Pseudoscalar boson and SM-like Higgs boson production at ILC in the left-right twin Higgs model

Besides the SM-like Higgs boson h, the left-right twin Higgs(LRTH) model predicts the existence of the neutral pseudoscalar boson ϕ0. In this Letter, we study the pair production of the pseudoscalar boson ϕ0 and SM-like Higgs bosons h at the International Linear Collider (ILC). We find that the production cross section of the process e+e−→hϕ0 are at the level of 10−1fb with reasonable parameter values, However, the resonance production cross section can be significantly enhanced, which can reach several hundreds fb. In some favorable case (for example, small values of f and mϕ0), the SM backgrounds are nowhere an issue by applying suitable cut on the bb¯ invariant mass spectrum. The ILC provides an idea environment for discovering the pseudoscalar boson and measuring its properties.