Sequestering CP Violation and GIM-Violation with Warped Extra Dimensions

TL;DR

This paper introduces a warped extra dimension model that naturally explains CP violation and suppresses strong CP problem contributions, aligning with experimental constraints and predicting a very small theta-bar.

Contribution

It presents a novel warped extra dimension framework with spontaneous CP violation and flavor sequestering, addressing the strong CP problem and flavor constraints.

Findings

Predicts theta-bar to be at least 10^-12

Suppresses radiative corrections to theta-bar

Consistent with flavor and electroweak constraints

Abstract

We propose a model of spontaneous CP violation to address the strong CP problem in warped extra dimensions that relies on sequestering flavor and CP violation. We assume that brane-localized Higgs Yukawa interactions respect a U(3) flavor symmetry that is broken only by bulk fermion mass and Yukawa terms. All CP violation arises from the vev of a CP-odd scalar field localized in the bulk. To suppress radiative corrections to theta-bar, the doublet quarks in this model are localized on the IR brane. We calculate constraints from flavor-changing neutral currents (FCNCs), precision electroweak measurements, CKM unitarity, and the electric dipole moments in this model and predict theta-bar to be at least about 10^-12.