Charged Higgs production at linear colliders in large extra dimensions

Abstract In the Two-Higgs-Doublet Model(2HDM) with large extra dimensions(LED), we study the contributions of virtual Kaluza-Klein(KK) gravitons to 2HDM charged Higgs production, especially in the two important production processes e+e− → H+H− and e+e− → Htb̄, at future linear colliders (LC). We find that KK graviton effects can significantly modify these total cross sections and also their differential cross sections compared to their respective 2HDM values and, therefore, can be used to probe the effective scale ΛT up to several TeV. For example, at √ s = 2TeV, the cross sections for e+e− → H+H− and e+e− → Htb̄ in the 2HDM are 7.4fb for mH− = 150GeV and 0.003fb for mH− = 1.1TeV and tanβ = 40 , while in LED they are 12.1fb and 0.01fb, respectively, for ΛT = 4Tev.