Abellan Beteta, CarlosCalvo Gómez, MíriamCamboni, AlessandroComerma Montells, AlbertDomingo Bonal, FrancescGarrido Beltrán, LluísGrabalosa Gándara, MarcGraciani Díaz, RicardoGraugés Pous, EugeniLópez Asamar, EliasPérez-Calero Yzquierdo, AntonioPicatoste Olloqui, EduardoPie Valls, B. (Blai)Potterat, CédricRives Molina, Vicente JoséRuiz, Hugo (Ruiz Pérez)Vázquez Gómez, RicardVilasis-Cardona, XavierLHCb Collaboration2019-05-212019-05-212012-12-050031-9007https://hdl.handle.net/2445/133579Measurements of B + c production and mass are performed with the decay mode B + c → J / ψ π + using 0.37     fb − 1 of data collected in p p collisions at √ s = 7     TeV by the LHCb experiment. The ratio of the production cross section times branching fraction between the B + c → J / ψ π + and the B + → J / ψ K + decays is measured to be ( 0.68 ± 0.10 ( stat ) ± 0.03 ( syst ) ± 0.05 ( lifetime ) ) % for B + c and B + mesons with transverse momenta p T > 4     GeV / c and pseudorapidities 2.5 < η < 4.5 . The B + c mass is directly measured to be 6273.7 ± 1.3 ( stat ) ± 1.6 ( syst )     MeV / c 2 , and the measured mass difference with respect to the B + meson is M ( B + c ) − M ( B + ) = 994.6 ± 1.3 ( stat ) ± 0.6 ( syst )     MeV / c 2 .8 p.application/pdfengcc by (c) CERN; LHCb Collaboration, 2012http://creativecommons.org/licenses/by/3.0/es/Física de partículesExperimentsParticle physicsExperimentsinfo:eu-repo/semantics/article6196352019-05-21info:eu-repo/semantics/openAccess