Exotic Quark Structure of Lambda(1405) in QCD Sum Rule

Abstract

A new analysis is performed in QCD sum rule for the lightest negative parity baryon Lambda (1405). Mixings of three-quark and five-quark Fock components are taken into account. Terms containing up to dimension 12 condensates are computed in the operator product expansion. It is found that the sum rule gives much stronger coupling of Lambda* to the five-quark operator so that the five-quark components occupy about 90% of Lambda (1405).

14pages

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Cited by in corpus (6)

• Role of five-quark components in radiative and strong decays of the Lambda(1405) resonance
• The $\Lambda (1405)$ as a Hybrid
• Chiral Structure of Vector and Axial-Vector Tetraquark Currents
• Study of the resonance contributions in the ${\Xi }_b^{-}\to p{K}^{-}{K}^{-}$ decay
• A possible interpretation of $\Lambda$ baryon spectrum with pentaquark components
• Chiral Symmetry of Nucleon Resonances in QCD sum rules