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The $\Xi_b^0 \rightarrow \Xi_c^+ D_s^-$ and $\Xi_b^- \rightarrow \Xi_c^0D_s^-$ decays are observed for the first time using proton-proton collisiondata collected by the LHCb experiment at a centre-of-mass energy of$\sqrt{s}=13\mathrm{TeV}$, corresponding to an integrated luminosity of$5.1\mathrm{fb}^{-1}$. The relative branching fractions times the beauty-baryonproduction cross-sections are measured to be  \begin{align*}  \mathcal{R}\left(\frac{\Xi_b^0}{\Lambda_b^0}\right) \equiv  \frac{\sigma\left(\Xi_b^0\right)}{\sigma\left(\Lambda_b^0\right)}  \times  \frac{\mathcal{B}\left(\Xi_b^0 \rightarrow \Xi_c^+D_s^-\right)}{\mathcal{B}\left(\Lambda_b^0 \rightarrow \Lambda_c^0D_s^-\right)}  =(15.8\pm1.1\pm0.6\pm7.7)\%,  \mathcal{R}\left(\frac{\Xi_b^-}{\Lambda_b^0}\right) \equiv  \frac{\sigma\left(\Xi_b^-\right)}{\sigma\left(\Lambda_b^0\right)}  \times  \frac{\mathcal{B}\left(\Xi_b^- \rightarrow \Xi_c^0D_s^-\right)}{\mathcal{B}\left(\Lambda_b^0 \rightarrow \Lambda_c^0D_s^-\right)}  =(16.9\pm1.3\pm0.9\pm4.3)\%,  \end{align*} where the first uncertainties are statistical, the secondsystematic, and the third due to the uncertainties on the branching fractionsof relevant charm-baryon decays. The masses of $\Xi_b^0$ and $\Xi_b^-$ baryonsare measured to be $m_{\Xi_b^0}=5791.12\pm0.60\pm0.45\pm0.24\mathrm{MeV}/c^2$and $m_{\Xi_b^-}=5797.02\pm0.63\pm0.49\pm0.29\mathrm{MeV}/c^2$, where theuncertainties are statistical, systematic, and those due to charm-hadronmasses, respectively.

Observation of $\Xi_b^0 \rightarrow \Xi_c^+ D_s^-$ and $\Xi_b^- \rightarrow \Xi_c^0 D_s^-$ decays