A new OPE-entropy-based optimization framework for QCD sum rule windows predicts the fully charmed 2++ tetraquark mass at 6.32 ± 0.11 GeV.
Exotic B_c-like molecules in QCD Sum Rules
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abstract
We use the QCD sum rules to study possible $B_c$-like molecular states. We consider isoscalar $J^P = 0^+$ and $J^P = 1^+ D^{(\ast)}B^{(\ast)}$ molecular currents. We consider the contributions of condensates up to dimension eight and we work at leading order in ${\alpha}_s$ . We obtain for these states masses around 7 GeV.
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Beyond Borel Windows: A Systematic Optimization Framework for QCD Sum Rules
A new OPE-entropy-based optimization framework for QCD sum rule windows predicts the fully charmed 2++ tetraquark mass at 6.32 ± 0.11 GeV.