Dark origin of quark flavor hierarchy and mixing

TL;DR

This paper proposes a dark sector-based mechanism for generating quark flavor hierarchy and mixing, explaining the CKM matrix structure through radiative effects involving a dark flavon, with implications for collider phenomenology.

Contribution

It introduces a novel dark flavon field that induces off-diagonal Yukawa couplings via loop diagrams, providing a new dynamical origin for quark mixing.

Findings

Successfully reproduces CKM matrix elements with perturbative couplings

Predicts new collider signatures from dark sector interactions

Outlines rich phenomenology for LHC and future experiments

Abstract

We provide a dynamical mechanism for the generation of the Cabibbo-Kobayashi-Maskawa matrix in the context of a recently proposed model of flavor. The framework, based on the paradigm that Yukawa couplings are effective low energy couplings generated radiatively by dark sector interactions, is here extended to include a new scalar field which plays the role of a {\it dark flavon}. Being singlet under the Standard Model gauge group but charged under the $U(1)$ symmetry of the dark sector, this particle sources new two- and three-loop diagrams that result in off-diagonal Yukawa interactions, thereby providing a simple explanation for the observed structure of the CKM matrix. By using an effective parametrization of these new loop contributions, we show that the CKM matrix elements can be correctly reproduced for perturbative values of the involved couplings. We outline the rich phenomenology predicted by the scenario and detail its implications for the LHC and future collider experiments.