Scalar fully-heavy tetraquark states $$QQ^\prime {\bar{Q}} \bar{Q^\prime }$$ in QCD sum rules

Abstract Very recently, the LHCb Collaboration observed distinct structures with $$cc{\bar{c}}{\bar{c}}$$ c ¯ in $$J/\Psi $$ J / Ψ -pair mass spectrum. In this work, we construct four scalar ( $$J^{PC} = 0^{++}$$ PC = 0 + ) $$[8_c]_{Q\bar{Q^\prime }}\otimes [8_c]_{Q^\prime {\bar{Q}}}$$ [ 8 ] Q ′ ⊗ type currents to investigate fully-heavy tetraquark state $$Q Q^\prime {\bar{Q}} \bar{Q^\prime }$$ framework of QCD sum rules, where $$Q=c, b$$ , b and $$Q^\prime c, . Our results suggest that broad structure around 6.2-6.8 GeV can be interpreted as $$0^{++}$$ octet–octet states masses $$6.44\pm 0.11$$ 6.44 ± 0.11 $$6.52\pm 0.10$$ 6.52 0.10 GeV, narrow 6.9 $$6.87\pm 6.87 $$6.96\pm 6.96 respectively. Extending b-quark sector,the their fully-bottom partners are found 18.38-18.59 GeV. Additionally, also analyze spectra $$[8_c]_{c{\bar{c}}}\otimes [8_c]_{b {\bar{b}}}$$ $$[8_c]_{c{\bar{b}}}\otimes {\bar{c}}}$$ states, which lie range 12.51–12.74 12.49–12.81