Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/131833
Title: Amplitude analysis and branching fraction measurement of B¯s0→J/ψK+K-
Author: Camboni, Alessandro
Comerma Montells, Albert
Garrido Beltrán, Lluís
Graciani Díaz, Ricardo
Graugés Pous, Eugeni
López Asamar, Elias
Pérez-Calero Yzquierdo, Antonio
Picatoste Olloqui, Eduardo
Potterat, Cédric
Rives Molina, Vicente José
Ruiz, Hugo (Ruiz Pérez)
Vázquez Gómez, Ricard
Abellan Beteta, Carlos
Calvo Gómez, Míriam
Vilasis-Cardona, Xavier
Domingo Bonal, Francesc
LHCb Collaboration
Keywords: Física de partícules
Experiments
Particle physics
Experiments
Issue Date: 1-Apr-2013
Publisher: American Physical Society
Abstract: An 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.
Note: Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.87.072004
It is part of: Physical Review D, 2013, vol. 87, num. 7, p. 072004
URI: http://hdl.handle.net/2445/131833
Related resource: https://doi.org/10.1103/PhysRevD.87.072004
ISSN: 1550-7998
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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