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, MíriamVilasis-Cardona, XavierDomingo Bonal, FrancescLHCb Collaboration2019-04-082019-04-082013-04-011550-7998https://hdl.handle.net/2445/131833An amplitude analysis of the final state structure in the ¯¯¯ B 0 s → J / ψ K + K − decay mode is performed using 1.0     fb − 1 of data collected by the LHCb experiment in 7 TeV center-of-mass energy p p collisions produced by the LHC. A modified Dalitz plot analysis of the final state is performed using both the invariant mass spectra and the decay angular distributions. Resonant structures are observed in the K + K − mass spectrum as well as a significant nonresonant S -wave contribution over the entire K + K − mass range. The largest resonant component is the ϕ ( 1020 ) , accompanied by f 0 ( 980 ) , f ′ 2 ( 1525 ) , and four additional resonances. The overall branching fraction is measured to be B ( ¯¯¯ B 0 s → J / ψ K + K − ) = ( 7.70 ± 0.08 ± 0.39 ± 0.60 ) × 10 − 4 , where the first uncertainty is statistical, the second systematic, and the third due to the ratio of the number of ¯¯¯ B 0 s to B − mesons produced. The mass and width of the f ′ 2 ( 1525 ) are measured to be 1522.2 ± 2.8 + 5.3 − 2.0     MeV and 84 ± 6 + 10 − 5     MeV , respectively. The final state fractions of the other resonant states are also reported.23 p.application/pdfengcc by (c) CERN; LHCb Collaboration, 2013http://creativecommons.org/licenses/by/3.0/es/Física de partículesExperimentsParticle physicsExperimentsinfo:eu-repo/semantics/article6289752019-04-08info:eu-repo/semantics/openAccess