Exotic Quark Structure of Lambda(1405) in QCD Sum Rule
T. Nakamura, J. Sugiyama, N. Ishii, T. Nishikawa, and M. Oka
TL;DR
This paper uses QCD sum rules to analyze the Lambda(1405) baryon, revealing it is predominantly a five-quark state with about 90% composition, highlighting its exotic quark structure.
Contribution
It introduces a new QCD sum rule analysis that incorporates three-quark and five-quark mixings up to dimension 12 condensates for Lambda(1405).
Findings
Lambda(1405) has about 90% five-quark component.
The sum rule indicates a strong coupling to five-quark operators.
The analysis includes up to dimension 12 condensates.
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).
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.