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Title: | First observation of B¯0 → J/ψK+K- and search for B¯0 → J/ψϕ decays |
Author: | Calvo Gómez, Míriam Camboni, Alessandro Comerma Montells, Albert Garrido Beltrán, Lluís Graciani Díaz, Ricardo Graugés Pous, Eugeni Oyanguren Campos, Arantza de Pérez-Calero Yzquierdo, Antonio Picatoste Olloqui, Eduardo Potterat, Cédric Rives Molina, Vicente José Ruiz, Hugo (Ruiz Pérez) Ruiz Valls, Pablo Vilasis-Cardona, Xavier LHCb Collaboration |
Keywords: | Física de partícules Experiments Diagrames de Feynman Col·lisions (Física nuclear) Particle physics Experiments Feynman diagrams Collisions (Nuclear physics) |
Issue Date: | 14-Oct-2013 |
Publisher: | American Physical Society |
Abstract: | The first observation of the ¯¯¯ B 0 → J / ψ K + K − decay is presented with a data sample corresponding to an integrated luminosity of 1.0 fb − 1 of p p collisions at a center-of-mass energy of 7 TeV collected with the LHCb detector. The branching fraction is measured to be B ( ¯¯¯ B 0 → J / ψ K + K − ) = ( 2.53 ± 0.31 ± 0.19 ) × 10 − 6 , where the first uncertainty is statistical and the second is systematic. An amplitude analysis of the final state in the ¯¯¯ B 0 → J / ψ K + K − decay is performed to separate resonant and nonresonant contributions in the K + K − spectrum. Evidence of the a 0 ( 980 ) resonance is reported with statistical significance of 3.9 standard deviations. The corresponding product branching fraction is measured to be B ( ¯¯¯ B 0 → J / ψ a 0 ( 980 ) , a 0 ( 980 ) → K + K − ) = ( 4.70 ± 3.31 ± 0.72 ) × 10 − 7 , yielding an upper limit of B ( ¯¯¯ B 0 → J / ψ a 0 ( 980 ) , a 0 ( 980 ) → K + K − ) < 9.0 × 10 − 7 at 90% confidence level. No evidence of the resonant decay ¯¯¯ B 0 → J / ψ ϕ is found, and an upper limit on its branching fraction is set to be B ( ¯¯¯ B 0 → J / ψ ϕ ) < 1.9 × 10 − 7 at 90% confidence level. |
Note: | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.88.072005 |
It is part of: | Physical Review D, 2013, vol. 88, num. 7, p. 072005 |
URI: | http://hdl.handle.net/2445/131784 |
Related resource: | https://doi.org/10.1103/PhysRevD.88.072005 |
ISSN: | 1550-7998 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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