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The LHCb collaboration has recently reported a 2.5 $\sigma$ discrepancy withrespect to the predicted value in a test of lepton universality in the ratio$R_{K^*}= \hbox{BR}(B \to K^* \mu^+ \mu^-) / \hbox{BR}(B \to K^* e^+ e^-)$.Coupled with an earlier observation of a similar anomaly in $R_{K}$, this hasgenerated significant excitement. A number of new physics scenarios have beenproposed to explain the anomaly. In this work we consider simplified limits on$Z'$ models from ATLAS and CMS searches for new resonances in dilepton anddijet modes, and we use the simplified limits variable $\zeta$ to correlate theresults of the resonance and B-decay experiments. By examining minimal $Z'$models that can accomodate the observed LHCb results, we show that thehigh-mass resonance search results are begining to be sensitive to these modelsand that future results will be more informative.

$R_K$ anomalies and simplified limits on $Z'$ models at the LHC