# $R_K$ and $R_{K^*}$ in an Aligned 2HDM with Right-Handed Neutrinos

## TL;DR

This paper proposes a model combining a 2-Higgs Doublet Model with a low scale seesaw mechanism, explaining recent anomalies in B-meson decays through new leptonic contributions mediated by charged Higgs bosons and right-handed neutrinos.

## Contribution

It introduces a novel aligned 2HDM framework with right-handed neutrinos that can simultaneously explain $R_K$ and $R_{K^*}$ anomalies via non-universal leptonic effects.

## Key findings

- Model successfully accounts for $R_K$ and $R_{K^*}$ anomalies.
- Large Yukawa couplings enable significant leptonic contributions.
- Box diagrams with charged Higgs and neutrinos are key to the explanation.

## Abstract

We consider the possibility to explain the recent $R_K$ and $R_{K ^*}$ anomalies in a 2-Higgs Doublet Model, known as Aligned, combined with a low scale seesaw mechanism generating light neutrino masses and mixings. In this class of models, a large Yukawa coupling allows for significant non-universal leptonic contributions, through box diagrams mediated by charged Higgs bosons and right-handed neutrinos, to the $b \to s \ell^+ \ell^-$ transition that can then account for both $R_K$ and $R_{K^*}$ anomalies.