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Observation of the Doubly Charmed Baryon Ξ++cc Alfonso Albero, Alejandro Badalov, Alexey Calvo Gómez, Míriam Camboni, Alessandro Coquereau, Samuel Fernandez, G. Garrido Beltrán, Lluís Gascón Fora, David Graciani Díaz, Ricardo Graugés Pous, Eugeni Marin Benito, Carla Picatoste Olloqui, Eduardo Rives Molina, Vicente José Sánchez Gonzalo, David Vilasis-Cardona, Xavier LHCb Collaboration Física de partícules Experiments Particle physics Experiments A highly significant structure is observed in the Λc+K-π+π+ mass spectrum, where the Λc+ baryon is reconstructed in the decay mode p K-π+. The structure is consistent with originating from a weakly decaying particle, identified as the doubly charmed baryon Ξcc ++. The difference between the masses of the Ξcc ++ and Λc+ states is measured to be 1334.94 ±0.72 (stat.) ±0.27 (syst. ) MeV /c2 , and the Ξcc ++ mass is then determined to be 3621.40 ±0.72 (stat.) ±0.27 (syst. ) ±0.14 (Λc+) MeV /c2 , where the last uncertainty is due to the limited knowledge of the Λc+ mass. The state is observed in a sample of proton-proton collision data collected by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 1.7 fb-1, and confirmed in an additional sample of data collected at 8 TeV. 2019-05-03T13:35:25Z 2019-05-03T13:35:25Z 2017-09-11 2019-05-03T13:35:25Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 0031-9007 https://hdl.handle.net/2445/132664 678017 eng Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.119.112001 Physical Review Letters, 2017, vol. 119, num. 11, p. 112001 https://doi.org/10.1103/PhysRevLett.119.112001 cc by (c) CERN; LHCb Collaboration, 2017 http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess 10 p. application/pdf American Physical Society Articles publicats en revistes (Física Quàntica i Astrofísica)