νl decays with Mc=(J/ψ,Xc0), where Xc0≡X0(3872) is regarded as the tetraquark state ccuu(dd). With the decay constant fXc0=(234±52) MeV determined from the data, we predict that B(B-→Xc0π-)=(11.5±5.7)×10-6, B(B0→Xc0K0)=(2.1±1.0)×10-4, and B(Bs0→Xc0K0)=(11.4±5.6)×10-6. With the form factors in QCD models, we calculate that B(Bc-→Xc0π-,Xc0K-)=(6.0±2.6)×10-5 and (4.7±2.0)×10-6, and B(Bc-→J/ψμ-νμ, Xc0μ-νμ)=(2.3±0.6)×10-2 and (1.35±0.18)×10-3, respectively, and extract the ratio of the fragmentation fractions to be fc/fu=(6.4±1.9)×10-3."> Branching fractions of B<sub>(c)</sub> decays involving J/ψ and <em>X</em>(3872) -
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