Leptoquark model to explain the $B$-physics anomalies, $R_K$ and $R_D$

TL;DR

This paper proposes a scalar leptoquark model with light right-handed neutrinos that can simultaneously explain the observed anomalies in B-meson decay ratios, $R_K$ and $R_D$, and makes testable predictions.

Contribution

The paper introduces a specific scalar leptoquark model that successfully accounts for both $R_K$ and $R_D$ anomalies, providing a viable new physics explanation.

Findings

Model explains $R_K$ and $R_D$ anomalies simultaneously.

The model is consistent with current experimental constraints.

It predicts new phenomena testable in future experiments.

Abstract

We show that a model with a scalar leptoquark of hypercharge $Y=1/6$ which includes the light right-handed neutrinos, can successfully describe both of the $B$-physics anomalies, $R_K^{\rm exp} < R_K^{\rm SM}$ and $R_D^{\rm exp} > R_D^{\rm SM}$. We discuss the corresponding low energy effective theory and, after using the known experimental data as constraints, we show that the model is viable and that it offers several predictions which can be tested experimentally.