First observation of the decay ${\Lambda }_b^0\to {\eta }_c(1S)p{K}^{-}$

LHCb collaboration, R. Aaij, C. Abellán Beteta +985

The decay ${\Lambda }_b^0\to {\eta }_c(1S)p{K}^{-}$ is observed for the first time using a data sample of proton-proton collisions, corresponding to an integrated luminosity of 5.5 $f{b}^{-1}$, coll…