2026-06-29T08:14:06Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/456172023-09-07T15:44:42Zcom_20.500.14352_14col_20.500.14352_21

M_(π) and N_c dependence of resonances form Unitarized Chiral Perturbation Theory Rios, G. Hanhart, Christoph Peláez Sagredo, José Ramón 51-73 One-loop Scattering Amplitude Física-Modelos matemáticos Física matemática ISSN: 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. Depto. de Física Teórica Fac. de Ciencias Físicas TRUE pub 2023-06-20T05:47:38Z 2023-06-20T05:47:38Z 2011 book part https://hdl.handle.net/20.500.14352/45617 XXXX-XXXX 10.1063/1.3647171 eng AIP Conference Proceedings open access application/pdf Amer Inst Physics