# Collider Constraints on $Z^\prime$ Models for Neutral Current $B-$Anomalies

## TL;DR

This paper analyzes collider data to constrain $Z'$ models proposed for explaining neutral current $B$-anomalies, finding significant bounds on model parameters from LHC measurements and $B_s$ mixing.

## Contribution

It provides the first comprehensive collider constraints on simple $Z'$ models addressing $B$-anomalies, including the impact of LHC SM measurements and specific model bounds.

## Key findings

- The MDM model is strongly constrained by ATLAS di-muon searches.
- The MUM model faces weaker collider constraints.
- In the Third Family Hypercharge Model, $Z'$ mass must exceed 1.2 TeV based on combined constraints.

## Abstract

We examine current collider constraints on some simple $Z^\prime$ models that fit neutral current $B-$anomalies, including constraints coming from measurements of Standard Model (SM) signatures at the LHC. The `MDM' simplified model is not constrained by the SM measurements but {\em is} strongly constrained by a 139 fb$^{-1}$ 13 TeV ATLAS di-muon search. Constraints upon the `MUM' simplified model are much weaker. A combination of the current $B_s$ mixing constraint and ATLAS' $Z^\prime$ search implies $M_{Z^\prime}>1.2$ TeV in the Third Family Hypercharge Model example case. LHC SM measurements rule out a portion of the parameter space of the model for $M_{Z^\prime}<1.5$ TeV.