Hidden charm-bottom structures bcb‾c‾: Axial-vector case

Mass and width of a hidden charm-bottom axial-vector structure T containing bcb‾c‾ quarks are calculated in QCD sum rule framework. It is treated as a diquark-antidiquark state built of scalar diquark and axial-vector antidiquark components. The mass of T is computed using the two-point sum rule method. The width of this particle is evaluated by considering eight decay modes: The decays to ηbJ/ψ, ηcϒ(1S), Bc−Bc⁎+, and Bc+Bc⁎− are dissociation processes, in which all initial quarks are distributed between the final-state particles. The decays to DD and BB mesons with appropriate charges and spin-parities are channels generated due to the annihilations of bb‾ and cc‾ quarks from T. Partial widths for all of these processes are obtained by employing the three-point sum rule approach necessary to find the strong couplings at relevant tetraquark-meson-meson vertices. Our results for the mass m=(12715±90)MeV and width Γ[T]=(140±13)MeV of the tetraquark T, as well as its numerous decay channels explored in this article are useful for ongoing and future experimental investigations of fully heavy resonances.