TRIPLE HIGGS BOSON PRODUCTION AT THE 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 three additional Higgs bosons: one neutral Higgs phi(0) and a pair of charged Higgs bosons phi(+/-). In this paper, we focus on the study of the triple Higgs production at the ILC, i.e. e(+)e(-) -> phi(0)phi(+)phi(-) and e(+)e(-) -> hh phi(0). We present the production cross-sections and the distributions of the various observables, such as, the distributions of the energy and the transverse momenta of neutral and charged Higgs bosons, the differential cross-section of the invariant mass of final Higgs bosons pair, and the production angle distributions of neutral Higgs boson and charged Higgs boson. Our numerical results show that, for the processes e(+)e(-) -> phi(0)phi(+)phi(-) and e(+)e(-) -> hh phi(0), the production rates are at the level of 10(-1) fb with reasonable parameter values while the resonance production cross-section can be significantly enhanced and reach several tens fb. The signatures for signals and corresponding standard model backgrounds are also investigated for the decay mode phi(0) -> b (b) over bar.