2026-06-27T12:38:56Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/337732024-09-04T16:34:48Zcom_20.500.14352_14col_20.500.14352_15

Cohen, Thomas Llanes Estrada, Felipe José Peláez Sagredo, José Ramón Ruiz De Elvira Carrascal, Jacobo 2023-06-19T13:27:48Z 2023-06-19T13:27:48Z 2014-08-14 1550-7998 10.1103/PhysRevD.90.036003 https://hdl.handle.net/20.500.14352/33773 http://journals.aps.org/prd/abstract/10.1103/PhysRevD.90.036003 http://journals.aps.org/ We study the large N_c behavior of couplings among light meson states with different compositions in terms of quarks and gluons. We shortly review the most common compositions of mesons, which are of interest for the understanding of low-lying meson resonances, namely, the ordinary quark-antiquark states as well as the nonordinary glueball, tetraquark, and other states. We dedicate special attention to Jaffe's generalization of the tetraquark with N_c - 1 q -q over bar q pairs, which is the only type of state we have identified whose width does not necessarily vanish with N_c, though it does decouple exponentially with N_c from the ππ channel, so that it is weakly coupled to the meson-meson system. eng open access Nonordinary light meson couplings and the 1/N_c expansion journal article