The Ξ(1620) and Ξ(1690) molecular states from S = −2 meson-baryon interaction up to next-to-leading order
We have studied the meson-baryon interaction in the neutral sector using an extended Unitarized Chiral Perturbation Theory, which takes into account not only the leading Weinberg-Tomozawa term (as all the previous studies in sector), but also the Born terms and next-to-leading order contribution. Ba...
| Authors: | , , |
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| Format: | article |
| Status: | Published version |
| Publication Date: | 2023 |
| Country: | España |
| Institution: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repository: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:2445/199613 |
| Online Access: | https://hdl.handle.net/2445/199613 |
| Access Level: | Open access |
| Keyword: | Teoria quàntica Partícules (Matèria) Quiralitat Quantum theory Particles Chirality |
| Summary: | We have studied the meson-baryon interaction in the neutral sector using an extended Unitarized Chiral Perturbation Theory, which takes into account not only the leading Weinberg-Tomozawa term (as all the previous studies in sector), but also the Born terms and next-to-leading order contribution. Based on the SU(3) symmetry of the chiral Lagrangian we took most of the model parameters from the BCN model [1], where these were fitted to a large amount of experimental data in the neutral sector. We have shown that our approach is able to generate dynamically both and states in very reasonable agreement with the data, and can naturally explain the puzzle with the decay branching ratios of . Our results clearly illustrate the reliability of chiral models implementing unitarization in coupled channels and the importance of considering Born and NLO contributions for precise calculations. |
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