# Interpreting Hints for Lepton Flavor Universality Violation

## TL;DR

This paper analyzes recent experimental hints of lepton flavor universality violation in rare B meson decays using a model-independent approach, identifying potential new physics regions and suggesting further measurements.

## Contribution

It provides a model-independent analysis of new physics explanations for lepton flavor universality violation in B decays and proposes specific experimental directions.

## Key findings

- Identifies parameter space consistent with experimental anomalies.
- Shows compatibility with other B decay anomalies.
- Suggests new physics phenomena below 100 TeV scale.

## Abstract

We interpret the recent hints for lepton flavor universality violation in rare $B$ meson decays. Based on a model-independent effective Hamiltonian approach, we determine regions of new physics parameter space that give a good description of the experimental data on $R_K$ and $R_{K^*}$, which is in tension with Standard Model predictions. We suggest further measurements that can help narrowing down viable new physics explanations. We stress that the measured values of $R_K$ and $R_{K^*}$ are fully compatible with new physics explanations of other anomalies in rare $B$ meson decays based on the $b \to s \mu\mu$ transition. If the hints for lepton flavor universality violation are first signs of new physics, perturbative unitarity implies new phenomena below a scale of $\sim 100$ TeV.