Camboni, AlessandroComerma Montells, AlbertGarrido Beltrán, LluísGraciani Díaz, RicardoGraugés Pous, EugeniLópez Asamar, EliasPérez-Calero Yzquierdo, AntonioPicatoste Olloqui, EduardoPotterat, CédricRives Molina, Vicente JoséRuiz, Hugo (Ruiz Pérez)Vázquez Gómez, RicardAbellan Beteta, CarlosCalvo Gómez, MíriamOyanguren Campos, Arantza deRuiz Valls, PabloVilasis-Cardona, XavierLHCb Collaboration2019-04-082019-04-082013-04-011550-7998https://hdl.handle.net/2445/131832The decay B + c → ψ ( 2 S ) π + with ψ ( 2 S ) → μ + μ − is observed with a significance of 5.2 σ using p p collision data corresponding to an integrated luminosity of 1.0     fb − 1 collected by the LHCb experiment. The branching fraction of B + c → ψ ( 2 S ) π + decays relative to that of the B + c → J / ψ π + mode is measured to be B ( B + c → ψ ( 2 S ) π + ) B ( B + c → J / ψ π + ) = 0.250 ± 0.068 ( stat ) ± 0.014 ( syst ) ± 0.006 ( B ) . The last term is the uncertainty on the ratio B ( ψ ( 2 S ) → μ + μ − ) / B ( J / ψ → μ + μ − ).7 p.application/pdfengcc by (c) CERN; LHCb Collaboration, 2013http://creativecommons.org/licenses/by/3.0/es/Física de partículesExperimentsParticle physicsExperimentsinfo:eu-repo/semantics/article6289742019-04-08info:eu-repo/semantics/openAccess