Axial-vector molecular structures Bc*±Bc?

Abstract

The axial-vector molecular structure M-AV = (Bc*+ Bc- + Bc*- Bc+)/2 is explored in QCD sum rule framework. The mass and current coupling of this compound are found by means of the two-point sum rule method. It turns out that the mass of M-AV is equal to m = (12770 +/- 60) MeV making possible its dissociations to pairs of J/psi eta(b), Upsilon eta(c), B-c*(+) B-c(-), and B-c*(-) B-c(+) mesons. The partial widths of these decay modes contain the strong couplings at M-AV-meson-meson vertices which are calculated by utilizing the three-point sum rule method. The full decay width of the molecule M-AV is formed due to these dominant processes and amounts to Gamma[M-AV] = (93 +/- 14) MeV. Our results for parameters m and Gamma[M-AV] of the hadronic molecule M-AV are useful for experimental studies of various fully heavy four-quark mesons.