Production of the Y(4260) state in B meson decay

We calculate the branching ratio for the production of the meson Y(4260)Y(4260) in the decay B−→Y(4260)K−B−→Y(4260)K−. We use QCD sum rules approach and we consider the Y(4260)Y(4260) to be a mixture between charmonium and exotic tetraquark, [c¯q¯][qc], states with JPC=1−−JPC=1−−. Using the value of the mixing angle determined previously as: θ=(53.0±0.5)∘θ=(53.0±0.5)∘, we get the branching ratio B(B→Y(4260)K)=(1.34±0.47)×10−6B(B→Y(4260)K)=(1.34±0.47)×10−6, which allows us to estimate an interval on the branching fraction 3.0×10−8