Possible enhancement of the e+e− → H±W∓ cross section in the two-Higgs-doublet model
نویسنده
چکیده
The production process of the charged Higgs-boson associated with a W boson at electron-positron colliders is discussed in the two-Higgs-Doublet Model (2HDM) and in the Minimal Supersymmetric Standard Model (MSSM). The process is induced at one-loop level in these models. We examine how much the cross section can be enhanced by quarkand Higgs-loop effects. In the non-SUSY 2HDM, in addition to large top-bottom (t-b) loop effects for small tan β (≪ √ mt/mb), the Higgs-loop diagrams can contribute to the cross section to some extent for moderate tan β values. For larger tanβ (≫ √ mt/mb), such enhancement by the Higgs non-decoupling effects is bounded by the requirement for validity of perturbation theory. In the MSSM with heavy super-partner particles, only the t-b loops enhance the cross section while Higgs-loop effects are very small. PACS: 12.60.Fr; 14.80.Cp
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