Hadrons and their distributions are the most direct observables in experiments, which would shed light on nonperturbative mystery of quantum chromodynamics. As result, any new hadron will challenge our current knowledge one hand, provide additional inputs other hand. The fully heavy $cc\overline{c}\overline{c}$ system observed by LHCb recently opened a era for physics. We first extract internal...

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 r...