[1507.03414] Observation of $J/\psi p$ resonances consistent with pentaquark states in ${\La
Abstract: Observations of exotic structures in the $J/\psi p$ channel, that we refer to as pentaquark-charmonium states, in $\Lambda_b^0\to J/\psi K^- p$ decays are presented. The data sample corresponds to an integrated luminosity of 3/fb...