Observation of Bc+ → J/ψDs+ and Bc+ → J/ψDs*+ decays

The decays B + c → J / ψ D + s and B + c → J / ψ D * + s are observed for the first time using a dataset, corresponding to an integrated luminosity of 3     fb − 1 , collected by the LHCb experiment in proton-proton collisions at center-of-mass energies of √ s = 7 and 8 TeV. The statistical signific...

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Detalles Bibliográficos
Autores: Abellan Beteta, Carlos, Calvo Gómez, Míriam, Camboni, Alessandro, Comerma Montells, Albert, Garrido Beltrán, Lluís, Graciani Díaz, Ricardo, Graugés Pous, Eugeni, López Asamar, Elias, Oyanguren Campos, Arantza de, Pérez-Calero Yzquierdo, Antonio, Picatoste Olloqui, Eduardo, Potterat, Cédric, Rives Molina, Vicente José, Ruiz, Hugo (Ruiz Pérez), Ruiz Valls, Pablo, Vázquez Gómez, Ricard, Vilasis-Cardona, Xavier, LHCb Collaboration
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2013
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/131841
Acceso en línea:https://hdl.handle.net/2445/131841
Access Level:acceso abierto
Palabra clave:Física de partícules
Experiments
Particle physics
Descripción
Sumario:The decays B + c → J / ψ D + s and B + c → J / ψ D * + s are observed for the first time using a dataset, corresponding to an integrated luminosity of 3     fb − 1 , collected by the LHCb experiment in proton-proton collisions at center-of-mass energies of √ s = 7 and 8 TeV. The statistical significance for both signals is in excess of 9 standard deviations. The following ratios of branching fractions are measured to be B ( B + c → J / ψ D + s ) B ( B + c → J / ψ π + ) = 2.90 ± 0.57 ± 0.24 , B ( B + c → J / ψ D * + s ) B ( B + c → J / ψ D + s ) = 2.37 ± 0.56 ± 0.10 , where the first uncertainties are statistical and the second systematic. The mass of the B + c meson is measured to be m B + c = 6276.28 ± 1.44 ( stat ) ± 0.36 ( syst )     MeV / c 2 , using the B + c → J / ψ D + s decay mode.

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