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キーワード:
High Energy Physics - Experiment, hep-ex
MPINP:
LHCb - Abteilung Hofmann
要旨:
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.