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The decays $\Lambda_b^0 \to \Lambda_c^+\bar{D}^{(*)0}K^-$ and $\Lambda_b^0\to \Lambda_c^+ D_s^{*-}$ are observed for the first time, in proton-protoncollision data at $\sqrt{s}=13$TeV corresponding to an integrated luminosity of5.4 fb${}^{-1}$ collected with the LHCb detector. Their ratios of branchingfractions with respect to the $\Lambda_b^0\!\to\Lambda_c^+\mathrm{D}_s^-$ modeare measured to be  \begin{align*}  \begin{split}  \frac{\mathcal{B}(\Lambda_b^0 \to \Lambda_c^+\bar{D}^0K^-)}{\mathcal{B}(\Lambda_b^0 \to \Lambda_c^+ D_s^-)} & = 0.1908{}_{-0.0034}^{+0.0036} {}_{-0.0018}^{+0.0016} \pm 0.0038 \\  \frac{\mathcal{B}(\Lambda_b^0 \to \Lambda_c^+\bar{D}^{*0}K^-)}{\mathcal{B}(\Lambda_b^0 \to \Lambda_c^+ D_s^-)} & = 0.589{}_{-0.017}^{+0.018} {}_{-0.018}^{+0.017} \pm 0.012 \\  \frac{\mathcal{B}(\Lambda_b^0 \to \Lambda_c^+D_s^{*-})}{\mathcal{B}(\Lambda_b^0 \to \Lambda_c^+ D_s^-)} & = 1.668 \pm 0.022{}_{-0.055}^{+0.061}\ ,  \end{split} \end{align*}  where the first uncertainties are statistical, the second systematic, and thethird, for the $\Lambda_b^0 \to \Lambda_c^+ \bar{D}^{(*)0} K^-$ decays, are dueto the uncertainties on the branching fractions of the $D_s^- \to K^- K^+\pi^-$ and $\bar{D}^0 \to K^+\pi^-$ decay modes. The measured branchingfractions probe factorization assumptions in effective theories and provide thenormalization for future pentaquark searches in $\Lambda_b^0 \to \Lambda_c^+\bar{D}^{(*)0}K^-$ decay channels.

Observation of $\Lambda_{b}^{0} \to \Lambda_{c}^{+} \bar{D}^{(*)0} K^{-}$ and $\Lambda_{b}^{0} \to \Lambda_{c}^{+} D_{s}^{*-}$ decays

Observation of $\Lambda_{b}^{0} \to \Lambda_{c}^{+} \bar{D}^{()0} K^{-}$ and $\Lambda_{b}^{0} \to \Lambda_{c}^{+} D_{s}^{-}$ decays