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

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https://doi.org/10.1103/PhysRevLett.122.222001
http://link.aps.org/pdf/10.1103/PhysRevLett.122.222001

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2019-06-05

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https://hdl.handle.net/2022/32089

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A narrow pentaquark state, Pc(4312)+, decaying to Jψp is discovered with a statistical significance of 7.3σ in a data sample of Λb0→J/ψpK− 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 5.4σ. Proximity of the Σc+D¯0 and Σc+D¯∗0 thresholds to the observed narrow peaks suggests that they play an important role in the dynamics of these states.

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LHCb Collaboration. "Observation of a narrow pentaquark state, Pc(4312)+, and of two-peak structure of the Pc(4450)+." Physical Review Letters, vol. 122, no. 22, 2019-06-05, https://doi.org/10.1103/PhysRevLett.122.222001.

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Physical Review Letters

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Faculty Open Access Articles