pentaquark-charmonium states, seen in Λb0 → J/ψpK– decays. [ m(Pc+(4450)) = 4449.8±1.7±2.5 MeV, Γ = 39±5±19 MeV ] [ m(Pc+(4380)) = 4380±8±29 MeV, Γ = 205±18±86 MeV ] The LHCb collaboration submitted today a paper based on run 1 data which reports the observation of pentaquark-charmonium states decaying into a J/ψ meson and a proton…