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.
Highlights
Light flavorless hadrons, f, are not entirely understood as qqstates
Understanding if the f states are explained by the quark model is crucial to identifying other exotic structures
Use of B → J=ψ f decays has been suggested as an excellent way of both measuring mixing angles and discerning if some of the f states are tetraquarks [8,9]
Summary
F, are not entirely understood as qqstates. Some states with the same quantum numbers such as the η and η0 exhibit mixing [1]. The signal sample used for BDT training is based on simulation, while the background sample uses the sideband 200–250 MeV above the B 0s mass peak from 1=3 of the available data. We fit the mass distribution using the same signal function shape for both B 0s and B 0 peaks.
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