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oai:recercat.cat:2445/1326642025-12-04T21:32:22Zcom_2072_1057col_2072_478812col_2072_478823col_2072_478904col_2072_478917

00925njm 22002777a 4500 dc Alfonso Albero, Alejandro author Badalov, Alexey author Calvo Gómez, Míriam author Camboni, Alessandro author Coquereau, Samuel author Fernandez, G. author Garrido Beltrán, Lluís author Gascón Fora, David author Graciani Díaz, Ricardo author Graugés Pous, Eugeni author Marin Benito, Carla author Picatoste Olloqui, Eduardo author Rives Molina, Vicente José author Sánchez Gonzalo, David author Vilasis-Cardona, Xavier author LHCb Collaboration author 2019-05-03T13:35:25Z 2019-05-03T13:35:25Z 2017-09-11 2019-05-03T13:35:25Z 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. Física de partícules Experiments Particle physics Experiments Observation of the Doubly Charmed Baryon Ξ++cc