# Relating the Cabibbo angle to $\tan\beta$ in a two Higgs-doublet model

## TL;DR

This paper links the Cabibbo angle to 2 in a two Higgs-doublet model with flavor symmetry, making the model highly predictive and consistent with flavor constraints.

## Contribution

It establishes a novel relation between 2 and 2 in a specific two Higgs-doublet model with flavor symmetry, reducing parameter freedom.

## Key findings

- The model predicts a specific 2-2 relation.
- Flavor changing neutral currents are sufficiently suppressed.
- Light nonstandard scalars are compatible with flavor constraints.

## Abstract

In a two Higgs-doublet model with $D_4$ flavor symmetry, we establish a relation between $\tan\beta$ and the Cabibbo angle. Due to a small number of parameters, the quark Yukawa sector of the model is very predictive. The flavor changing neutral currents are small enough to allow for relatively light nonstandard scalars to pass through the flavor constraints.