B-Factory Signals for a Warped Extra Dimension

We study predictions for $B$ physics in a class of warped extra dimension models recently introduced, where few ($\sim 3$) TeV Kaluza-Klein masses are consistent with electroweak data due to custodial symmetry. As in the standard model (SM), flavor violations arise due to the heavy top quark leading to striking signals: (i) New physics contributions to $\Delta F=2$ transitions are comparable to the SM, so the success of the SM unitarity triangle fit is a “coincidence.” Thus, clean extractions of unitarity angles are likely to be affected, in addition to $O(1)$ deviation from the SM prediction in $B_s$ mixing. (ii) $O(1)$ deviation from various SM predictions for $B\to X_s{l}^{+}{l}^{-}$. (iii) Large mixing-induced $CP$ asymmetry in radiative $B$ decays. Also, the neutron electric dipole moment is roughly 20 times larger than the current bound so that this framework has a “$CP$ problem.”