Observation of the doubly charmed baryon ${\Xi }_{cc}^{++}$

LHCb collaboration, R. Aaij, B. Adeva +805

A highly significant structure is observed in the ${\Lambda }_c^{+}{K}^{-}{\pi }^{+}{\pi }^{+}$ mass spectrum, where the ${\Lambda }_c^{+}$ baryon is reconstructed in the decay mode $p{K}^{-}{\pi }^{+}$. The structure is consistent…