A GIM Mechanism from Extra Dimensions

Abstract

We explore how to protect extra dimensional models from large flavor changing neutral currents by using bulk and brane flavor symmetries. We show that a GIM mechanism can be built in to warped space models such as Randall-Sundrum or composite Higgs models if flavor mixing is introduced via UV brane kinetic mixings for right handed quarks. We give a realistic implementation both for a model with minimal flavor violation and one with next-to-minimal flavor violation. The latter does not suffer from a CP problem. We consider some of the existing experimental constraints on Extra dimensional theories offer new avenues for flavor physics. Following the suggestion of Arkani-Hamed and Schmaltz [1], the standard approach is to use the overlaps of wave functions in extra dimensions to generate the fermion mass hierarchy. Since the fermions are physically located in different places this is referred to as the split-fermion approach. If