Doubly and singly charged Higgs pair production at high-energy e+e- linear colliders

The Higgs triplet model predicts the existence of the doubly and singly charged Higgs bosons (H-+/-+/- and H-+/-), whose decay modes are relevant to the vacuum expectation value of the triplet v(Delta) and the mass spectrum of these scalars. In this paper, we study the pair production of H++ H- via the processes in e(+)e(-) collisions: e(+)e(-) -> H++ H-W- and e(+)e(-) -> VV* -> e(-)nu H-e(++) H-. The numerical results show that the production rates can reach the level of several fb with a center of energy at the TeV scale. The characteristic signals and relevant SM backgrounds are also discussed in both the degenerate and nondegenerate cases. In most of the parameter spaces, their possible signals might be detected via these processes in the future high-energy linear collider experiments with root s = 3.0 TeV and (int) pound = 1000 fb(-1).