Publication: Nonordinary light meson couplings and the 1/N_c expansion
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Publication Date
2014-08-14
Authors
Cohen, Thomas
Ruiz de Elvira Carrascal, Jacobo
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American Physical Society
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Abstract
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.
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