We study a simple two-Higgs-doublet model in the Randall-Sundrum scenario, with an IR brane localized Higgs field and a second doublet arising from a $t\overline{t}$ condensate due to strong Kaluza-Klein gluon effects. The effective two-Higgs-doublet model predicts that the ratio of the brane to condensate vacuum expectation values $\tan \beta \sim 3$. It also predicts a standard-model-like Higgs boson of mass $\mathcal{O}(100)\mathrm{GeV}$ and a heavier scalar at the scale of the lowest Kaluza-Klein gluon mass, which we take to be $M_{\mathrm{KK}}\gtrsim 1.5\mathrm{TeV}$. The pseudoscalar and the charged scalars are degenerate in mass at tree level and are $\mathcal{O}(M_{\mathrm{KK}})$. There are no tree-level flavor-changing neutral currents for the down-type quarks and the standard model results hold there. In contrast, flavor-changing neutral current decays of the $t$ quark larger than in the standard model are expected.

• Received 19 April 2010

DOI:https://doi.org/10.1103/PhysRevD.82.115022