Heavy four-quark mesons bc(b)over-bar(c)over-bar : Scalar particle

Abstract

Parameters of the heavy four-quark scalar meson T(bc ()b() over bar()c() over bar) with content bc (b) over bar(c) over bar are calculated by means of the sum rule method. This structure is considered as a diquark-antidiquark state built of scalar diquark and antidiquark components. The mass and current coupling of T-bc (b) over bar(c) over bar are evaluated in the context of the two-point sum rule approach. The full width of this tetraquark is estimated by taking into account two types of its possible strong decay channels. First class includes dissociation of T-bc (b) over bar(c) over bar to mesons eta(c)eta(b), Bc+Bc-, Bc*+Bc*- and B-c(+)(1(3)P(0))B-c(*-). Another type of processes are generated by annihilations (b) over barb ->(q) over barq of constituent b-quarks which produces the final-state charmed meson pairs D+D-, D-0(D) over bar (0), D*+D*-, and D*(0)(D) over bar*(0). Partial width all of these decays are found using the three-point sum rule method which is required to calculate strong couplings at corresponding meson-meson-tetraquark vertices. Predictions obtained for the mass m = (12697 +/- 90)MeV and width Gamma[T-bc (b) over bar(c) over bar]=(142.4 +/- 16.9)MeV of this state are compared with alternative results, and are useful for further experimental investigations of fully heavy resonances.