Collider Signals of Top Quark Flavor Violation from a Warped Extra Dimension

Abstract

We study top quark flavor violation in the framework of a warped extra dimension with the Standard Model (SM) fields propagating in the bulk. Such a scenario provides solutions to both the Planck-weak hierarchy problem and the flavor puzzle of the SM without inducing a flavor problem. We find that, generically, tcZ couplings receive a huge enhancement, in particular the right handed ones can be O(1%). This results in BR(t -> c Z) at or above the sensitivity of the Large Hadron Collider (LHC). At the International Linear Collider (ILC), single top production, via e^+ e^- -> t \bar c, can be a striking signal for this scenario. In particular, it represents a physics topic of critical importance that can be explored even with a relatively low energy option, close to the tc threshold. At both the LHC and the ILC, angular distributions can probe the above prediction of dominance of right-handed couplings.

5 pages, references added, comment added regarding models with custodial symmetry for Z -> b \bar b

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• A custodial symmetry for Zbb
• Probing the Randall-Sundrum geometric origin of flavor with lepton flavor violation
• Flavour physics of the RS model with KK masses reachable at LHC
• Top Pair Production in Randall-Sundrum Models

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