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

2019/04/30 by LHCb collaboration, R. Aaij, C. Abellán Beteta +866 · 5 citations
Physics and Astronomy · #hep-ex

paper · pdf · doi:10.1103/physrevlett.122.222001

published as Phys. Rev. Lett. 122, 222001 (2019) · All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2019-014.html

arxiv created 2019/05/14 · arxiv updated 2019/06/12

Abstract

A narrow pentaquark state, P_c(4312)⁺, decaying to J/ψp is discovered with a statistical significance of 7.3σ in a data sample of Λ_b⁰→ J/ψp K^- decays which is an order of magnitude larger than that previously analyzed by the LHCb collaboration. The P_c(4450)⁺ pentaquark structure formerly reported by LHCb is confirmed and observed to consist of two narrow overlapping peaks, P_c(4440)⁺ and P_c(4457)⁺, where the statistical significance of this two-peak interpretation is 5.4σ. 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.

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