Fully-beauty tensor tetraquark

Abstract

Parameters of the fully-beauty tensor tetraquark $ T=bb\overline{b}\overline{b}$ are computed using QCD sum rule method. The mass $m$ and coupling $\Lambda$ of this state are evaluated by means of two-point sum rule approach. Prediction $m=(18530 \pm 86)~\mathrm{MeV}$ for the mass demonstrates that $T$ is stable against decays to pairs of $\eta_b \eta_b$ and $\Upsilon \Upsilon$ mesons. But it transforms to conventional particles due to $\overline{b}b$ annihilations to light quarks $\overline{q} q $ and $\overline{s}s$ followed by creation of mesons $B^{(\ast)+}B^{( \ast)-}$, $B^{(\ast)0}\overline{B}^{(\ast)0}$ and $B_s^{(\ast)0}\overline{B} _s^{(\ast)0}$. Partial width of these decay channels are calculated by invoking technical tools of three-point sum rule method. The latter allows us to estimate strong couplings at relevant tetraquark-meson-meson vertices and, hence, a width of the process under consideration. Our prediction $ \Gamma=(48 \pm 6)~\mathrm{MeV}$ along with the mass of this state can be valuable for experimental studies of all-heavy resonances.