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Nonordinary light meson couplings and the 1/N_c expansion



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Cohen, Thomas y Llanes Estrada, Felipe José y Peláez Sagredo, José Ramón y Ruiz de Elvira Carrascal, Jacobo (2014) Nonordinary light meson couplings and the 1/N_c expansion. Physical Review D, 90 (3). 036003-1. ISSN 1550-7998

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URL Oficial: http://journals.aps.org/prd/abstract/10.1103/PhysRevD.90.036003

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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.

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© 2014 American Physical Society. This work was partially supported by the Spanish Research Contracts No. FIS2008-01323, No. FPA2011-27853-C02-01, and No. FPA2011-27853-C02-02 and the DFG (No. SFB/TR 16, “Subnuclear Structure of Matter”). We acknowledge the support of the European Community-Research Infrastructure Integrating Activity “Study of Strongly Interacting Matter” (HadronPhysics2), Grant Agreement No. 227431 under the Seventh Framework Programme of the EU.

Palabras clave:Chiral Perturbation-Theory, Large N_c, Extraordinary Hadrons, 1-N Expansion, Resonances, Baryons, Quark
Materias:Ciencias > Física
Código ID:28285
Depositado:13 Feb 2015 15:12
Última Modificación:18 Mar 2015 09:05

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