Observation of ¯B0(s)→J/ψ f1(1285) Decays and Measurement of the f1(1285) Mixing Angle

Decays of ¯ B 0 s and ¯ B 0 mesons into J / ψ π + π − π + π − final states, produced in p p collisions at the LHC, are investigated using data corresponding to an integrated luminosity of 3     fb − 1 collected with the LHCb detector. ¯ B 0 ( s ) → J / ψ f 1 ( 1285 ) decays are seen for the first ti...

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Bibliographic Details
Published in:Physical review letters 2014-03
Main Authors: Badalov, Alexey, Calvo Gómez, Míriam, Camboni, Alessandro, Comerma Montells, Albert, Garrido Beltrán, Lluís, Gascón Fora, David, Graciani Díaz, Ricardo, Graugés Pous, Eugeni, Oyanguren Campos, Arantza de, Pérez-Calero Yzquierdo, Antonio, Potterat, Cédric, Ruiz, Hugo (Ruiz Pérez), Ruiz Valls, Pablo, Vilasis-Cardona, Xavier, LHCb Collaboration
Format: Article
Language:English
Subjects:
Experiments
Física de partícules
Particle physics
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Summary:Decays of ¯ B 0 s and ¯ B 0 mesons into J / ψ π + π − π + π − final states, produced in p p collisions at the LHC, are investigated using data corresponding to an integrated luminosity of 3     fb − 1 collected with the LHCb detector. ¯ B 0 ( s ) → J / ψ f 1 ( 1285 ) decays are seen for the first time, and the branching fractions are measured. Using these rates, the f 1 ( 1285 ) mixing angle between strange and nonstrange components of its wave function in the q ¯ q structure model is determined to be ± ( 24 . 0 + 3.1 + 0.6 − 2.6 − 0.8 ) ° . Implications on the possible tetraquark nature of the f 1 ( 1285 ) are discussed.
ISSN:0031-9007