# Anomalies in $b \to s$ transitions and dark matter

## TL;DR

This paper reviews the anomalies observed in $b o s$ transitions by LHCb, discusses new physics models addressing these anomalies, and explores their potential connection to dark matter, highlighting two detailed examples.

## Contribution

It provides a classification of models addressing $b o s$ anomalies and explores their possible links to dark matter, including detailed case studies.

## Key findings

- Identification of various $b o s$ anomalies and deviations from Standard Model predictions.
- Discussion of new physics models that could explain these anomalies.
- Illustration of potential connections between flavor anomalies and dark matter through detailed examples.

## Abstract

Since 2013, the LHCb collaboration has reported on the measurement of several observables associated to $b \to s$ transitions, finding various deviations from their predicted values in the Standard Model. These include a set of deviations in branching ratios and angular observables, as well as in the observables $R_K$ and $R_{K^\ast}$, specially built to test the possible violation of Lepton Flavor Universality. Even though these tantalizing hints are not conclusive yet, the $b \to s$ anomalies have gained considerable attention in the flavor community. Here we review New Physics models that address these anomalies and explore their possible connection to the dark matter of the Universe. After discussing some of the ideas introduced in these works and classifying the proposed models, two selected examples are presented in detail in order to illustrate the potential interplay between these two areas of current particle physics.