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.
QCD Sum Rule Study for a Possible Charmed Pentaquark \Theta c(3250)
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We use QCD sum rules to study the possible existence of a \Theta c(3250) charmed pentaquark. We consider the contributions of condensates up to dimension-10 and work at leading order in \alpha_s. We obtain m(\Theta c) = (3.21 +/- 0.13) GeV, compatible with the mass of the structure seen by BaBar Collaboration in the decay channel B- -> p- \Sigma c++ pi- pi-. The proposed state is compatible with a previous proposed pentaquark state in the anti-charmed sector.
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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.