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The first observation of the decay $\bar{B}^0_s \to D^0 K^{*0}$ using $pp$data collected by the LHCb detector at a centre-of-mass energy of 7 TeV,corresponding to an integrated luminosity of 36 pb$^{-1}$, is reported. Asignal of $34.4 \pm 6.8$ events is obtained and the absence of signal isrejected with a statistical significance of more than nine standard deviations.The $\bar{B}^0_s \to D^0 K^{*0}$ branching fraction is measured relative tothat of $\bar{B}^0 \to D^0 \rho^0$: $\frac{{\cal B}(\bar{B}^0_s \to D^0K^{*0})}{{\cal B}(\bar{B}^0 \to D^0 \rho^0)} = 1.48 \pm 0.34 \pm 0.15 \pm0.12$, where the first uncertainty is statistical, the second systematic andthe third is due to the uncertainty on the ratio of the $B^0$ and $B^0_s$hadronisation fractions.

physics letters b

First observation of the decay $\bar{B}^0_s \to D^0 K^{*0}$ and a  measurement of the ratio of branching fractions $\frac{{\cal B}(\bar{B}^0_s  \to D^0 K^{*0})}{{\cal B}(\bar{B}^0 \to D^0 \rho^0)}$