Observation of the ${\Lambda }_b^0\to J/\psi {\Xi }^{-}{K}^{+}$ and ${\Xi }_b^0\to J/\psi {\Xi }^{-}{\pi }^{+}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1131

The first observation of the ${\Xi }_b^0\to J/\psi {\Xi }^{-}{\pi }^{+}$ decay and the most precise measurement of the branching fraction of the ${\Lambda }_b^0\to J/\psi {\Xi }^{-}{K}^{+}$ decay are reported, using proton-…