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Observation of a Narrow Pentaquark State, 𝑃𝑐⁢(4312)+, and of the Two-Peak Structure of the 𝑃𝑐⁢(4450)+
(American Physical Society, 2019-06-05) Aaij, R.; Abellán Beteta, C.; Adeva, B.; Adinolfi, M.; Fernández Ramírez, César; et al. ; (LHCb Collaboration)
A narrow pentaquark state, 𝑃𝑐⁢(4312)+, decaying to 𝐽/𝜓⁢𝑝, is discovered with a statistical significance of 7.3⁢𝜎 in a data sample of Λ0𝑏→𝐽/𝜓⁢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 5.4⁢𝜎. The proximity of the Σ+𝑐⁢¯𝐷0 and Σ+𝑐⁢¯𝐷*0 thresholds to the observed narrow peaks suggests that they play an important role in the dynamics of these states