Decays of fully beauty scalar tetraquarks to BqBq and B*qB*q mesons

Abstract

Decays of the fully beauty four -quark structures X4b and T4b to B meson pairs are investigated in the framework of the QCD three-point sum rule method. We model the scalar exotic mesons X4b and T4b as diquark-antidiquark systems composed of the axial-vector and pseudoscalar diquarks, respectively. The masses m = (18540 +/- 50) MeV and m similar to = (18858 +/- 50) MeV of these compounds calculated in our previous articles fix possible decay channels of these particles. In the present work, we consider their decays to BqB over bar q and B*qB over bar *q (q = u, d, s, c) mesons. In the case of X4b, the mass of which is below the 2 eta b threshold, these channels determine essential part of its full width Gamma 4b. The tetraquark T4b can decay to the pair eta b eta b; therefore, partial widths of processes with B(B*) mesons in the final state permit us to refine our estimate for the full width of this particle. The predictions Gamma 4b = (9.6 +/- 1.1) MeV and Gamma similar to Full 4b = (144 +/- 29) MeV obtained in this article can be used in future experimental investigations of four b -quark mesons.