Observation of a Narrow Pentaquark State, <i>P<sub>c</sub></i>(4312)<SUP>+</SUP>, and of the Two-Peak Structure of the <i>P<sub>c</sub></i>(4450)<SUP>+</SUP>

Aaij, R, Beteta, C Abellan, Adeva, B, Adinolfi, M, Aidala, CA, Ajaltouni, Z, Akar, S, Albicocco, P, Albrecht, J, Alessio, F
et al (show 862 more authors) (2019) Observation of a Narrow Pentaquark State, <i>P<sub>c</sub></i>(4312)<SUP>+</SUP>, and of the Two-Peak Structure of the <i>P<sub>c</sub></i>(4450)<SUP>+</SUP>. PHYSICAL REVIEW LETTERS, 122 (22). 222001-.

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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_{b}^{0}→J/ψpK^{-} 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. The proximity of the Σ_{c}^{+}D[over ¯]^{0} and Σ_{c}^{+}D[over ¯]^{*0} thresholds to the observed narrow peaks suggests that they play an important role in the dynamics of these states.

Item Type: Article
Additional Information: 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
Uncontrolled Keywords: LHCb Collaboration
Depositing User: Symplectic Admin
Date Deposited: 15 Aug 2019 08:45
Last Modified: 11 Oct 2023 07:33
DOI: 10.1103/PhysRevLett.122.222001
Open Access URL: http://doi.org/10.1103/PhysRevLett.122.222001
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3051801