QCD sum rule evaluation of a tensor all-charm tetraquark yields mass 6609±50 MeV and width 165±23 MeV, supporting its role as a key component of the observed X(6600) resonance.
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QCD sum rule calculations give the J/ψ B_c⁺ molecular state a mass of 9740 ± 70 MeV and total width of 121 ± 17 MeV, with dominant fall-apart decays.
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Resonance $X(6600)$
QCD sum rule evaluation of a tensor all-charm tetraquark yields mass 6609±50 MeV and width 165±23 MeV, supporting its role as a key component of the observed X(6600) resonance.
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Molecular states $J/\psi B_{c}^{+}$ and $\eta_{c}B_{c}^{\ast +} $
QCD sum rule calculations give the J/ψ B_c⁺ molecular state a mass of 9740 ± 70 MeV and total width of 121 ± 17 MeV, with dominant fall-apart decays.