Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/131784
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
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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