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Measurements of the branching fractions of $B^0_s \to K^{*\pm}K^\mp$ and$B^0_s \to K^{*\pm}\pi^\mp$ decays are performed using a data samplecorresponding to $1.0 \ {\rm fb}^{-1}$ of proton-proton collision datacollected with the LHCb detector at a centre-of-mass energy of$7\mathrm{\,TeV}$, where the $K^{*\pm}$ mesons are reconstructed in the$K^0_{\rm S}\pi^\pm$ final state. The first observation of the $B^0_s \toK^{*\pm}K^\mp$ decay and the first evidence for the $B^0_s \to K^{*-}\pi^+$decay are reported with branching fractions \begin{eqnarray} {\cal B}(B^0_s \toK^{*\pm}K^\mp) & = & (12.7\pm1.9\pm1.9) \times 10^{-6}, \\ {\cal B}(B^0_s \toK^{*-}\pi^+) & = & ~(3.3\pm1.1\pm0.5) \times 10^{-6}, \end{eqnarray} where thefirst uncertainties are statistical and the second are systematic. In addition,an upper limit of ${\cal B}(B^0 \to K^{*\pm}K^\mp) < 0.4 \ (0.5) \times10^{-6}$ is set at $90\,% \ (95\,%)$ confidence level.

Observation of $B^0_s \to K^{*\pm}K^\mp$ and evidence for $B^0_s \to K^{*-}\pi^+$ decays

Observation of $B^0_s \to K^{\pm}K^\mp$ and evidence for $B^0_s \to K^{-}\pi^+$ decays