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.
QCD sum rule calculations yield masses of (15728 ± 90) MeV and (9712 ± 72) MeV with widths of (93 ± 17) MeV and (70 ± 10) MeV for the scalar molecules M_b and M_c, indicating dominant decays to eta_b B_c^- and eta_c B_c^+ channels.
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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.
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Scalar molecules $\eta _{b}B_{c}^{-}$ and $\eta _{c}B_{c}^{+} $ with asymmetric quark contents
QCD sum rule calculations yield masses of (15728 ± 90) MeV and (9712 ± 72) MeV with widths of (93 ± 17) MeV and (70 ± 10) MeV for the scalar molecules M_b and M_c, indicating dominant decays to eta_b B_c^- and eta_c B_c^+ channels.