RT Journal Article
T1 Nonordinary light meson couplings and the 1/N_c expansion
A1 Cohen, Thomas
A1 Llanes Estrada, Felipe José
A1 Peláez Sagredo, José Ramón
A1 Ruiz de Elvira Carrascal, Jacobo
AB 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.
PB American Physical Society
SN 1550-7998
YR 2014
FD 2014-08-14
LK https://hdl.handle.net/20.500.14352/33773
UL https://hdl.handle.net/20.500.14352/33773
LA eng
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NO © 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.
NO European Community- Research Infrastructure Integrating Activity
NO Comisión Interministerial de Ciencia y Tecnología (CICYT)
NO Ministerio de Economía y Competitividad (MEC)
DS Docta Complutense
RD 29 abr 2024