The Flavor-locked Flavorful Two Higgs Doublet Model

TL;DR

This paper introduces a novel flavorful two Higgs doublet model combined with a flavor-locking mechanism to naturally generate quark mass hierarchies and CKM matrix structure, with potential distinctive collider signatures and implications for meson oscillations.

Contribution

It develops a new framework integrating flavorful 2HDM with flavor-locking, automatically producing realistic quark hierarchies and CKM matrix features.

Findings

Hierarchical CKM matrix with observed mixing angles

Potential for distinctive collider signatures

Exotic contributions to meson oscillations that fit current data

Abstract

We propose a new framework to generate the Standard Model (SM) quark flavor hierarchies in the context of two Higgs doublet models (2HDM). The `flavorful' 2HDM couples the SM-like Higgs doublet exclusively to the third quark generation, while the first two generations couple exclusively to an additional source of electroweak symmetry breaking, potentially generating striking collider signatures. We synthesize the flavorful 2HDM with the `flavor-locking' mechanism, that dynamically generates large quark mass hierarchies through a flavor-blind portal to distinct flavon and hierarchon sectors: Dynamical alignment of the flavons allows a unique hierarchon to control the respective quark masses. We further develop the theoretical construction of this mechanism, and show that in the context of a flavorful 2HDM-type setup, it can automatically achieve realistic flavor structures: The CKM matrix is automatically hierarchical with $|V_{cb}|$ and $|V_{ub}|$ generically of the observed size. Exotic contributions to meson oscillation observables may also be generated, that may accommodate current data mildly better than the SM itself.