Observation of the ${\Lambda }_b^0\to J/\psi p{\pi }^{-}$ decay

LHCb collaboration, R. Aaij, B. Adeva +702

The first observation of the Cabibbo-suppressed decay ${\Lambda }_b^0\to J/\psi p{\pi }^{-}$ is reported using a data sample of proton-proton collisions at 7 and 8 TeV, corresponding to an in…