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.
Extrinsic hyperspheres in manifolds with special holonomy
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We describe extrinsic hyperspheres and totally geodesic hypersurfaces in manifolds with special holonomy. In particular we prove the nonexistence of extrinsic hyperspheres in quaternion-Kaehler manifolds. We develop a new approach to extrinsic hyperspheres based on the classification of special Killing forms.
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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.