The pole structure of the Lambda(1405) in a recent QCD simulation
| Autor: | Molina, R., Doring, M. |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Phys. Rev. D 94, 056010 (2016) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevD.94.056010 |
| Popis: | The $\Lambda(1405)$ baryon is difficult to detect in experiment, absent in many quark model calculations, and supposedly manifested through a two-pole structure. Its uncommon properties made it subject to numerous experimental and theoretical studies in recent years. Lattice-QCD eigenvalues for different quark masses were recently reported by the Adelaide group. We compare these eigenvalues to predictions of a model based on Unitary Chiral Perturbation Theory. The UCHPT calculation predicts the quark mass dependence remarkably well. It also explains the overlap pattern with different meson-baryon components, mainly $\pi\Sigma$ and $\bar KN$, at different quark masses. More accurate lattice QCD data are required to draw definite conclusions on the nature of the $\Lambda(1405)$. Comment: 14 pages, 4 figures |
| Databáze: | arXiv |
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