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A narrow pentaquark state, $P_c(4312)^+$, decaying to $J/\psi p$ isdiscovered with a statistical significance of $7.3\sigma$ in a data sample of${\Lambda_b^0\to J/\psi p K^-}$ decays which is an order of magnitude largerthan that previously analyzed by the LHCb collaboration. The $P_c(4450)^+$pentaquark structure formerly reported by LHCb is confirmed and observed toconsist of two narrow overlapping peaks, $P_c(4440)^+$ and $P_c(4457)^+$, wherethe statistical significance of this two-peak interpretation is $5.4\sigma$.Proximity of the $\Sigma_c^+\bar{D}^{0}$ and $\Sigma_c^+\bar{D}^{*0}$thresholds to the observed narrow peaks suggests that they play an importantrole in the dynamics of these states.

Observation of a narrow pentaquark state, $P_c(4312)^+$, and of two-peak structure of the $P_c(4450)^+$