Large Hadron Collider Constraints on Some Simple $Z'$ Models for $b\to s\mu^+\mu^-$ Anomalies

TL;DR

This paper analyzes Large Hadron Collider data to constrain simple $Z'$ models that aim to explain anomalies in $b o s\mu^+\mu^-$ transitions, focusing on specific models and their parameter spaces.

Contribution

It provides the first detailed collider constraints on the $B_3-L_2$ and third family hypercharge $Z'$ models addressing flavor anomalies.

Findings

Strong bounds on $Z'$ mass below 300 GeV for $B_3-L_2$ model

Parameter regions fitting $b o s\mu^+\mu^-$ data are constrained by collider measurements

Certain model variants are excluded or tightly limited by current LHC data

Abstract

We examine current Large Hadron Collider constraints on some simple $Z'$ models that significantly improve on Standard Model fits to $b\to s\mu^+\mu^-$ transition data. The models that we consider are the 'third family baryon number minus second family lepton number' $(B_3-L_2)$ model and the 'third family hypercharge' model and variants. The constraints are applied on parameter regions of each model that fit the $b\to s\mu^+\mu^-$ transition data and come from high-mass Drell-Yan di-muons and measurements of Standard Model processes. This latter set of observables place particularly strong bounds upon the parameter space of the $B_3-L_2$ model when the mass of the $Z'$ boson is less than 300 GeV.