Constraints on the malaphoric $B_3-L_2$ model from di-lepton resonance searches at the LHC

TL;DR

This paper examines constraints on a modified $B_3-L_2$ model with a $Z'$ boson from LHC di-lepton resonance searches, highlighting the model's potential to explain anomalies in $B$-meson decays.

Contribution

It introduces a malaphoric $B_3-L_2$ model with enhanced couplings to lighter families and analyzes its viability against LHC data, extending the parameter space where it can explain flavor anomalies.

Findings

Constraints exclude $Z'$ masses below 2.8 TeV for most of the parameter space.

A significant region remains where the model improves Standard Model predictions for $b ightarrow s l^+ l^-$ transitions.

Future HL-LHC data could probe $Z'$ masses up to 4.2 TeV.

Abstract

We confront the malaphoric $B_3-L_2$ model with bounds coming from a search for resonances in the di-lepton channels at the 13~TeV LHC. In contrast to the original $B_3-L_2$ model, the $Z^\prime$ of the malaphoric $B_3-L_2$ model has sizeable couplings to the lighter two families; these originate from order unity kinetic mixing with the hypercharge gauge boson and ameliorate the fit to lepton flavour universality measurements in $B-$meson decays. The $Z^\prime$ coupling to the first two families of quark means that the resulting constraints from resonant di-lepton searches are stronger. Nevertheless, we find that for $M_{Z^\prime}>2.8$ TeV there remains a non-negligible region of allowed parameter space where the model significantly improves upon several Standard Model predictions for observables involving the $b \rightarrow s l^+ l^-$ transition. We estimate that the 3000 fb$^{-1}$ HL-LHC will extend this sensitivity to $M_{Z^\prime}= 4.2$ TeV.