Nature of light scalar mesons from their large N_c behavior



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Peláez Sagredo, José Ramón (2004) Nature of light scalar mesons from their large N_c behavior. Physical review letters, 92 (10). ISSN 0031-9007

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We show how to obtain information about the states of an effective field theory in terms of the underlying fundamental theory. In particular, we analyze the spectroscopic nature of meson resonances from the meson-meson scattering amplitudes of the QCD low energy effective theory, combined with the expansion in the large number of colors. The vectors follow a q̅q behavior, whereas the, σ,ĸ, and f_0 (980) scalars disappear fo large N_c, in support of a q̅ q̅ qq -like nature. The a_0 shows a similar pattern, but the uncertainties are large enough to accommodate both interpretations.

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©2004 The American Physical Society.
his work was supported in part by funds provided by the Spanish DGI with Grant Nos. BFM2002-03218, BFM2000-1326 and BFM2002-01003; CICYT Grant No. FPA2000-0956; Junta de Andalucía Grant No. FQM-225 and EURIDICE with contract number HPRN-CT-2002-00311.

Uncontrolled Keywords:Chiral perturbation-theory; Scattering phase-Shift; Multi-quark hadrons; π-π-Scattering; One-loop; Sigma; Unitarization; Lagrangians; Resonance; AmplitudeUnitarization; Lagrangians; Resonance; Amplitude
Subjects:Sciences > Physics > Physics-Mathematical models
Sciences > Physics > Mathematical physics
ID Code:35516
Deposited On:04 Feb 2016 12:52
Last Modified:10 Dec 2018 15:09

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