Flavor from Minimal Flavor Violation & a Viable Randall-Sundrum Model

TL;DR

This paper introduces a minimal flavor violation framework within a Randall-Sundrum warped extra dimension model, effectively suppressing flavor violation and addressing flavor and CP problems at low Kaluza-Klein scales.

Contribution

It develops a novel 5D minimal flavor violation setup in RS models, controlling flavor violation via Yukawa matrices and achieving suppression of flavor issues at low energies.

Findings

Flavor violation is dominated by the third generation.

Suppression of flavor violation is achieved with a single parameter.

The model eliminates the RS flavor and CP problems at 2 TeV scale.

Abstract

We present a variant of the warped extra dimension, Randall-Sundrum (RS), framework which is based on five dimensional (5D) minimal flavor violation (MFV), in which the only sources of flavor breaking are two 5D anarchic Yukawa matrices. The Yukawa matrices also control the bulk masses, which are responsible for the resulting flavor structure and mass hierarchy in the low energy theory. An interesting result of this set-up is that at low energies the theory flows to next to MFV model where flavor violation is dominantly coming from the third generation. Low energy flavor violation is further suppressed by a single parameter that dials the amount of violation in the up or down sector. There is therefore a sharp limit in which there is no flavor violation in the down type quark sector which, remarkably, is favored when we fit for the flavor parameters. This mechanism is used to eliminate the current RS flavor and CP problem even with a Kaluza-Klein scale as low as 2 TeV! Our construction also suggests that economic supersymmetric and non-supersymmetric, strong dynamic-based, flavor models may be built based on the same concepts.