Abstract
Abstract Besides the SM-like Higgs boson h , the Georgi–Machacek (GM) model predicts the existence of doubly-charged Higgs bosons H 5 ± ± in the 5-plet representation, which can be seen the typical particles in this model. We first used the latest Higgs boson diphoton signal strength data to find the allowed region at 2 σ confidence level on the plane of the scalar mass values m H and the triple scalar coupling parameter g h H H , and then focus on the study of the triple Higgs production process e + e − → h H 5 + + H 5 − − at the future International Linear collider (ILC). Our numerical results show that, the values of the production cross section are very sensitive to the triple Higgs coupling strength g h H H and can reach the level several fb in the reasonable parameter space. Considering the same-sign diboson decay H 5 ± ± → W ± W ± , the expected discovery reach at the future ILC experiments are also studied.
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