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We present a simple $U(1)_{B_3-3L_\mu}$ gauge Standard Model extension thatcan easily account for the anomalies in $R(K)$ and $R(K^*)$ reported by LHCb.The model is economical in its setup and particle content. Among the StandardModel fermions, only the third generation quark family and the secondgeneration leptons transform non-trivially under the new $U(1)_{B_3-3L_\mu}$symmetry. This leads to lepton non-universality and flavor changing neutralcurrents involving the second and third quark families. We discuss the relevantexperimental constraints and some implications.

$U(1)_{B_3-3L_\mu}$ gauge symmetry as a simple description of $b\to s$ anomalies