# Anomaly-free local horizontal symmetry and anomaly-full rare B-decays

## TL;DR

This paper explores a specific local horizontal symmetry model within the Standard Model extended with right-handed neutrinos, which can explain recent anomalies in B meson decays and is testable through direct searches.

## Contribution

It characterizes a class of anomaly-free local horizontal symmetry models compatible with Pati-Salam unification that can account for lepton universality violation in B decays.

## Key findings

- Model can explain recent B decay anomalies
- Predicted gauge bosons are accessible in current experiments
- Provides a framework linking flavor effects to new gauge symmetries

## Abstract

The largest global symmetry that can be made local in the Standard Model + 3$\nu_R$ while being compatible with Pati-Salam unification is $SU(3)_H\times U(1)_{B-L}$. The gauge bosons of this theory would induce flavour effects involving both quarks and leptons, and are a potential candidate to explain the recent reports of lepton universality violation in rare B meson decays. In this letter we characterise this type of models and show how they can accommodate the data and naturally be within reach of direct searches.