Weak decays of the double-beauty tetraquark

The spectroscopic parameters and decay channels of the axial-vector tetraquark 2 13 built heavy diquark bb light antidiquark us are explored using QCD sum rule method. Because this state is stable against strong electromagnetic decays, we consider its semileptonic nonleptonic modes. Partial widths weak processes T AV b:s¯ → Z 0 lv¯ l M calculated form factors G i ( q ) computed by three-point rules: scalar with quark content bcus¯ a vector meson. full width mean lifetime obtained in work shed on features double-beauty tetraquarks useful for their experimental investigations.