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 $1.0{\mathrm{fb}}^{-1}$, collected by the LHCb detector. The Cabibbo-suppressed decays ${\mathrm{\Lambda }}_b^0\to D^{0}p{K}^{-}$ and ${\mathrm{\Lambda }}_b^0\to {\mathrm{\Lambda }}_c^{+}{K}^{-}$ are observed, and their branching fractions are measured with respect to the decays ${\mathrm{\Lambda }}_b^0\to D^{0}p{\pi }^{-}$ and ${\mathrm{\Lambda }}_b^0\to {\mathrm{\Lambda }}_c^{+}{\pi }^{-}$. 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.

• Received 20 November 2013

DOI:https://doi.org/10.1103/PhysRevD.89.032001

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© 2014 CERN, for the LHCb Collaboration