# Observation of B^0_(s) -> J/\psi f_1(1285) decays and measurement of the f_1(1285) mixing angle

Abstract : Decays of Bs and B0 mesons into J/\psi \pi +\pi -\pi +\pi - final states, produced in pp collisions at the LHC, are investigated using data corresponding to an integrated luminosity of 3/fb collected with the LHCb detector. B^0_(s) -> J\psi 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 non-strange components of its wave function in the q-qbar structure model is determined to be \pm (24.0^{+3.1+0.6}_{-2.6-0.8}) degrees. Implications on the possible tetraquark nature of the f_1(1285) are discussed.
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Journal articles
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Submitted on : Wednesday, October 9, 2013 - 11:04:47 AM
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### Citation

R. Aaij, Y. Amhis, S. Barsuk, O. Callot, J. He, et al.. Observation of B^0_(s) -> J/\psi f_1(1285) decays and measurement of the f_1(1285) mixing angle. Physical Review Letters, American Physical Society, 2014, 112, pp.091802. ⟨10.1103/PhysRevLett.112.091802⟩. ⟨in2p3-00871239⟩

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