Oset, E.Hosaka, ANacher, J. C.Oka, M.Oller, J. A.Parreño, A.Peláez Sagredo, José RamónRamos, A.Toki, H.2023-06-202023-06-202000-01-311. J. Gasser and H. Leutwyler, Ann. Phys. 158(1984)142; Nucl. Phys. B250(1985)465 2. A. Dobado, M. J. Herrero and T. N. Truong, Phys. Lett. B235(1990)134; A. Dobado and J. R. Peláez, Phys. Rev. D47(1993)4883 3. F. Guerrero and J. A. Oller, Nucl. Phys. B 537(1999)459 4. J. A. Oller, E. Oset and J. R. Peláez, Phys. Rev. Lett. 80(1998)3452; Phys. Rev. D 57(1999)074001 5. J. A. Oller and E. Oset, Nucl. Phys. A620(1997)438; erratum ibid 624(1999)407 6. E. Oset and A. Ramos, Nucl. Phys. A635(1998)99 7. N. Kaiser, T. Waas and W. Weise, Nucl. Phys. A612 (1997) 297 8. A. Parreño, A. Ramos and E. Oset, in preparation 9. J. A. Oller and E. Oset, Phys. Rev. D in print hep-ph/9809337 10. J. C. Nacher, E. Oset, H. Toki and A. Ramos, Phys. Lett. B in print, nucl- th/9902071 11. D. Jido, M.Oka and A. Hosaka, Physical Review Letters, 80(1998)448 12. D. Jido, Y. Nemoto, M. Oka and A. Hosaka, preprint, hep-ph/9805306 13. E. Oset, A. Ramos, E. Marco, J. C. Nacher and H. Toki, nucl-th/99071020375-9474https://hdl.handle.net/20.500.14352/59875©Elsevier Science Bv. International Conference on Particles and Nuclei (15. 1999. Upsala, Suecia).We report on recent progress on the chiral unitary approach, which is shown to have a much larger convergence radius than ordinary chiral perturbation theory, allowing one to reproduce data for meson meson interaction up to 1.2 GeV and meson baryon interaction up to the first baryonic resonances. Applications to physical processes so far unsuited for a standard chiral perturbative approach are presented, concretely the K⁻ p → Λ(1405) γ reaction and the N*(1535) N+(1535) π and η couplings.engjournal articlehttp://dx.doi.org/10.1016/S0375-9474(99)00640-5http://www.sciencedirect.comhttp://arxiv.org/abs/hep-ph/9908496open access51-73Perturbation-theoryScatteringSymmetryChannelsπFísica-Modelos matemáticosFísica matemática