Studies of beauty baryon decays to $D^{0}p{h}^{-}$ and ${\mathrm{\Lambda }}_c^{+}{h}^{-}$ final states

Decays of beauty baryons to the $D^{0}p{h}^{-}$ and ${\mathrm{\Lambda }}_c^{+}{h}^{-}$ final states (where $h$ indicates a pion or a kaon) are studied using a data sample of $pp$ collisions, corresponding to an integrated luminosity of 1.0 fb${}^{-1}$, collected by the LHCb detector. The Cabibbo-suppressed decays $\Lambda_b^0\to D^0 p K^-$and$\Lambda_b^0\to \Lambda_c^+ K^-$ are observed and their branching fractions are measured with respect to the decays $\Lambda_b^0\to D^0 p \pi^-$and$\Lambda_b^0\to \Lambda_c^+ \pi^-$. In addition, the first observation is reported of the decay of the neutral beauty-strange baryon ${\mathrm{\Xi }}_b^0$ to the $D^{0}p{K}^{-}$ final state, and a measurement of the ${\mathrm{\Xi }}_b^0$ mass is performed. Evidence of the ${\mathrm{\Xi }}_b^0\to {\mathrm{\Lambda }}_c^{+}{K}^{-}$ decay is also reported.