Badalov, AlexeyCalvo Gómez, MíriamCamboni, AlessandroComerma Montells, AlbertGarrido Beltrán, LluísGascón Fora, DavidGraciani Díaz, RicardoGraugés Pous, EugeniMarin Benito, CarlaPicatoste Olloqui, EduardoRives Molina, Vicente JoséRuiz, Hugo (Ruiz Pérez)Vilasis-Cardona, XavierLHCb Collaboration2019-05-132019-05-132014-05-210031-9007https://hdl.handle.net/2445/133075First observations of the decays Λ 0 b → Λ + c D − ( s ) are reported using data corresponding to an integrated luminosity of 3     fb − 1 collected at 7 and 8 TeV center-of-mass energies in proton-proton collisions with the LHCb detector. In addition, the most precise measurement of the branching fraction B ( B 0 s → D + D − s ) is made and a search is performed for the decays B 0 ( s ) → Λ + c Λ − c . The results obtained are B ( Λ 0 b → Λ + c D − ) / B ( Λ 0 b → Λ + c D − s ) = 0.042 ± 0.003 ( stat) ± 0.003 ( syst ) , [ B ( Λ 0 b → Λ + c D − s ) B ( ¯ B 0 → D + D − s ) ] / [ B ( Λ 0 b → Λ + c π − ) B ( ¯ B 0 → D + π − ) ] = 0.96 ± 0.02 ( stat) ± 0.06 ( syst) , B ( B 0 s → D + D − s ) / B ( ¯ B 0 → D + D − s ) = 0.038 ± 0.004 ( stat) ± 0.003 ( syst) , B ( ¯ B 0 → Λ + c Λ − c ) / B ( ¯ B 0 → D + D − s ) < 0.0022 [ 95 %     C . L . ] , B ( B 0 s → Λ + c Λ − c ) / B ( B 0 s → D + D − s ) < 0.30 [ 95 %     C . L . ] . Measurement of the mass of the Λ 0 b baryon relative to the ¯ B 0 meson gives M ( Λ 0 b ) − M ( ¯ B 0 ) = 339.72 ± 0.24 ( stat ) ± 0.18 ( syst)     MeV / c 2 . This result provides the most precise measurement of the mass of the Λ 0 b baryon to date.9 p.application/pdfengcc by (c) CERN; LHCb Collaboration, 2014http://creativecommons.org/licenses/by/3.0/es/Física de partículesExperimentsParticle physicsExperimentsinfo:eu-repo/semantics/article6457642019-05-13info:eu-repo/semantics/openAccess