# On Light Resonance Interpretations of the B Decay Anomalies

## TL;DR

This paper proposes a novel method using precision Drell-Yan measurements at the LHC to search for light di-muon resonances, providing constraints on models explaining B decay anomalies and discussing implications for the muon g-2 discrepancy.

## Contribution

It introduces a new approach to detect light di-leptonic resonances via existing LHC data, offering model-independent constraints relevant to B decay anomalies.

## Key findings

- Existing LHC data constrains light di-muon resonance models.
- The method links B decay anomalies with collider resonance searches.
- Implications for the muon g-2 discrepancy are discussed.

## Abstract

We sketch a novel method to search for light di-leptonic resonances by exploiting precision measurements of Drell-Yan production. Motivated by the recent hints of lepton flavour universality violation in $B \to K^{\ast} \ell^+ \ell^-$, we illustrate our proposal by studying the case of spin-1 resonances that couple to muons and have masses in the range of a few GeV. We show that the existing LHC data on $pp \to Z/\gamma^\ast \to \mu^+ \mu^-$ put non-trivial constraints on light di-muon resonance interpretations of $B$ decay anomalies in a model-independent fashion. The impact of our proposal on the long-standing discrepancy in the anomalous magnetic moment of the muon is also briefly discussed.