  We calculate the Standard Model (SM) predictions for the differential
branching ratio of the rare $B_s \to \phi\mu^+ \mu^-$ decays using $B_s \to
\phi$ transition form factors (TFFs) obtained using holographic light-front QCD
(hQCD) instead of the traditional QCD sum rules (QCDSR) . Our predictions for
the differential branching ratio is in better agreement with the LHCb data.
Also, we find that the hQCD prediction for $R_{K^*\phi}$, the ratio of the
branching fraction of $B \to K^* \mu^+ \mu^-$ to that of $B_s \to \phi\mu^+
\mu^-$ , is in excellent agreement with both the LHCb and CDF results in low
$q^2$ range.
