2026-06-29T07:48:07Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/456252023-09-07T19:52:01Zcom_20.500.14352_14col_20.500.14352_21

N_c and m_π dependence of ρ and σ mesons from unitarized Chiral Perturbation Theory Rios, G. Hanhart, C. Peláez Sagredo, José Ramón 51-73 Scalar mesons Chiral lagrangians 1/Nc expansion Física-Modelos matemáticos Física matemática ©Amer Inst Physics. ISSN: 0094-243X International Workshop on Chiral Symmetry in Hadrons and Nuclei (2010. Valencia). We review our work on the ρ and σ resonances 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/Nc expansion gives a clear definition of ¯qq states, which is neatly satisfied by the ρ but not by the σ, showing that its dominant component is not ¯qq. 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 ρππ coupling constant is mπ independent, in contrast with the σππ coupling, that shows a strong m_π dependence. Depto. de Física Teórica Fac. de Ciencias Físicas TRUE pub 2023-06-20T05:47:45Z 2023-06-20T05:47:45Z 2010 book part https://hdl.handle.net/20.500.14352/45625 XXXX-XXXX 10.1063/1.3542024 eng AIP Conference Proceedings open access application/pdf American Institute of Physics