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We propose an extension of the standard model (SM) with $U(1)_{\mu-\tau}$gauge symmetry, extra vectorlike quark doublets $Q'_a$ and singlet scalar$\chi$, both of which are charged under $U(1)_{\mu-\tau}$ and carry {odd} dark$Z_2$ parity. Then assuming that $\chi$ is the dark matter (DM) of the universeand imposing various constraints from dark matter search, flavor physics andcollider search for $Q'_a$, one can show that radiative corrections to$b\rightarrow s Z^{'*} \rightarrow s l^+ l^- $ involving $Q'_a$ and $\chi$ caninduce $\Delta C_9 \sim -1$ which can resolve the LHCb anomalies related with$B\to K^{(*)} \ell^+ \ell^-$. Therefore both DM and $B$ physics anomalies couldbe accommodated in the model.

Explaining $B\to K^{(*)}\ell^+ \ell^-$ anomaly by radiatively induced coupling in $U(1)_{\mu-\tau}$ gauge symmetry