Aaij, R.Abellán Beteta, C.Adeva, B.Adinolfi, M.Fernández Ramírez, Césaret al. (LHCb Collaboration)2024-12-032024-12-032019-06-05Aaij, R., Abellán Beteta, C., Adeva, B., Adinolfi, M., Aidala, C. A., Ajaltouni, Z., Akar, S., Albicocco, P., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, Fernández Ramírez, César, et al. (2019). Observation of a Narrow Pentaquark State, Pc (4312)+, and of the Two-Peak Structure of the Pc (4450)+. Physical Review Letters, 122(22), 222001. https://doi.org/10.1103/PhysRevLett.122.2220011079-7114, 0031-9007https://doi.org/10.1103/PhysRevLett.122.222001https://hdl.handle.net/20.500.14468/24674The registered version of this article, first published in “Physical Review Letters, 122(4)222001", is available online at the publisher's website: American Physical Society, https://doi.org/10.1103/PhysRevLett.122.222001La versión registrada de este artículo, publicado por primera vez en “Physical Review Letters, 122(4)222001", está disponible en línea en el sitio web del editor: American Physical Society, https://doi.org/10.1103/PhysRevLett.122.222001A 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 stateseninfo:eu-repo/semantics/openAccessartículo