A narrow pentaquark state, Pc(4312)+, decaying to J/psi p, is discovered with a statistical significance of 7.3sigma in a data sample of Λb0 -> J/psi p K- decays, which is an order of magnitude larger than that previously analyzed by the LHCb Collaboration. The Pc(4450)+ pentaquark structure formerly reported by LHCb is confirmed and observed to consist of two narrow overlapping peaks, Pc(4440)+ and Pc(4457)+, where the statistical significance of this two-peak interpretation is 5.4sigma. The proximity of the Σc+ Dbar0 and Σc+ D*bar0 thresholds to the observed narrow peaks suggests that they play an important role in the dynamics of these states.
Observation of a Narrow Pentaquark State, Pc(4312)+, and of the Two-Peak Structure of the Pc(4450)+
Fernández-Ramírez, C;Pilloni, A;
2019-01-01
Abstract
A narrow pentaquark state, Pc(4312)+, decaying to J/psi p, is discovered with a statistical significance of 7.3sigma in a data sample of Λb0 -> J/psi p K- decays, which is an order of magnitude larger than that previously analyzed by the LHCb Collaboration. The Pc(4450)+ pentaquark structure formerly reported by LHCb is confirmed and observed to consist of two narrow overlapping peaks, Pc(4440)+ and Pc(4457)+, where the statistical significance of this two-peak interpretation is 5.4sigma. The proximity of the Σc+ Dbar0 and Σc+ D*bar0 thresholds to the observed narrow peaks suggests that they play an important role in the dynamics of these states.| File | Dimensione | Formato | |
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PhysRevLett.122.222001.pdf
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