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A search for $B^{+} \to D_s^{+}K^{+}K^{-}$ decays is performed using $pp$collision data corresponding to an integrated luminosity of 4.8 fb$^{-1}$,collected at centre-of-mass energies of 7, 8 and 13$\,$TeV with the LHCbexperiment. A significant signal is observed for the first time and thebranching fraction is determined to be \begin{equation*} \mathcal{B}(B^{+} \toD_s^{+}K^{+}K^{-} ) = (7.1 \pm 0.5 \pm 0.6 \pm 0.7) \times 10^{-6},\end{equation*} where the first uncertainty is statistical, the secondsystematic and the third due to the uncertainty on the branching fraction ofthe normalisation mode $B^{+} \to D_s^{+} \overline{\kern -0.2em D}^{0}$. Asearch is also performed for the pure annihilation decay $B^{+} \toD_s^{+}\phi$. No significant signal is observed and a limit of\begin{equation*} \mathcal{B}(B^{+} \to D_s^{+}\phi) < 4.9 \times 10^{-7}~(4.2\times 10^{-7}) \end{equation*} is set on the branching fraction at 95$\%$(90$\%$) confidence level.

First observation of $B^{+} \to D_s^{+}K^{+}K^{-}$ decays and a search for $B^{+} \to D_s^{+}\phi$ decays