A GIM Mechanism from Extra Dimensions

TL;DR

This paper proposes a GIM mechanism within warped extra-dimensional models to suppress flavor-changing neutral currents, using UV brane kinetic mixings for right-handed quarks, and discusses experimental constraints.

Contribution

It introduces a novel GIM mechanism in warped space models utilizing UV brane kinetic mixings, applicable to minimal and next-to-minimal flavor violation scenarios.

Findings

GIM mechanism effectively suppresses flavor-changing neutral currents.

Models are consistent with existing precision electroweak constraints.

Next-to-minimal flavor violation model avoids CP problems.

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 these models implied by precision electroweak tests.