Rios, G.Hanhart, ChristophPeláez Sagredo, José Ramón2023-06-202023-06-2020111. S. Weinberg, Physica A96 (1979) 327. J. Gasser and H. Leutwyler, Annals Phys. 158 (1984) 142; 2. G. ’t Hooft, Nucl. Phys. B 72, 461 (1974). E. Witten, Annals Phys. 128, 363 (1980). 3. T. N. Truong, Phys. Rev. Lett. 61 (1988) 2526. Phys. Rev. Lett. 67, (1991) 2260; A. Dobado et al., Phys. Lett. B235 (1990) 134. 4. A. Dobado and J. R. Peláez, Phys. Rev. D 47 (1993) 4883; Phys. Rev. D 56 (1997) 3057. 5. F. Guerrero and J. A. Oller, Nucl. Phys. B 537 (1999) 459 [Erratum-ibid. B 602 (2001) 641]. J. R. Peláez, Mod. Phys. Lett. A 19, 2879 (2004) A. Gómez Nicola and J. R. Peláez, Phys. Rev. D 65 (2002) 054009 and AIP Conf. Proc. 660 (2003) 102. 6. A. Gómez Nicola, J.R. Peláez and G. Ríos, Phys. Rev. D 77 (2008) 056006. 7. J. R. Pelaez, Phys. Rev. Lett. 92, 102001 (2004) 8. J. R. Pelaez and G. Rios, Phys. Rev. Lett. 97, 242002 (2006) 9. J. R. Pelaez and G. Rios, arXiv:0905.4689 [hep-ph]. 10. C. Hanhart, J. R. Pelaez and G. Rios, Phys. Rev. Lett. 100, 152001 (2008) 11. D. Morgan, Nucl. Phys. A 543 (1992) 632; D. Morgan and M. R. Pennington, Phys. Rev. D 48 (1993) 1185. 12. E. van Beveren et al., AIP Conf. Proc. 660, 353 (2003); Phys. Rev. D 74, 037501 (2006). 13. D. Fernandez-Fraile, A. Gomez Nicola and E. T. Herruzo, Phys. Rev. D 76, 085020 (2007) 14. Ph. Boucaud et al. [ETM Collaboration], Phys. Lett. B 650, 304 (2007) C. Allton et al. [RBC and UKQCD Collaborations], Phys. Rev. D 76, 014504 (2007) C. W. Bernard et al.,Phys. Rev. D 64, 054506 (2001) C. R. Allton et al.Phys. Lett. B 628, 125 (2005) M. Gockeler et al.[QCDSF Collaboration], [arXiv:hep-lat/0810.5337]. 15. P. C. Bruns and U.-G. Meißner, Eur. Phys. J. C 40 (2005) 97.978-0-7354-0934-710.1063/1.3647171https://hdl.handle.net/20.500.14352/45617ISSN: 0094-243X © 2011 American Institute of Physics 978-0-7354-0934-7. International Conference on Meson-Nucleon Physics and the Structure of the Nucleon (MENU 2010) (12. 2011. New York).We review our studies on the ρ and σ resonances properties derived from the Inverse Amplitude Method. In particular, we study the leading 1/N_c behavior of the resonances masses and widths and their evolution with changing m_(π). The 1/N_c expansion gives a clear definition of q̅ q states, which is neatly satisfied by the ρ but not by the σ, showing that its dominant component is not q̅q. The m_(π) dependence of the resonance properties is relevant to connect with lattice studies. We show that our predictions compare well with some lattice results and we find that the rho π πcoupling constant is m_π independent, in contrast with the σ π π coupling, that shows a strong m_π dependence.engbook parthttp://dx.doi.org/10.1063/1.3647171http://scitation.aip.orgopen access51-73One-loopScatteringAmplitudeFísica-Modelos matemáticosFísica matemática