Light scalar and vector mesons in the large N_c limit from unitarized chiral perturbation theory

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Amer Inst Physics
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We review the large N_c behavior of light scalar and vector resonances generated from unitarized meson-meson scattering amplitudes at one loop in Chiral Perturbation Theory. The vectors nicely follow the behavior expected for q̅q states, whereas scalar mesons do not. This suggests that the main component of light scalars is not q̅q. We also comment on t-channel vector exchange as well as on the large N_c behavior of the mass splittings between the vectors generated from the inverse amplitude method.
©Amer Inst Physics. ISSN: 0094-243X International Conference on Hadron Spectroscopy (11. 2005. Rio de Janeiro, Brasil). The author thanks the HADRON05 organizers for creating such a nice working atmosphere during the Conference and S. Leupold and R. Kaminski for comments and discussions. Work partially supported by the DGICYT contracts BFM2002-01868, and the EURIDICE network contract HPRN-CT-2002-00311 as well as the EU Hadron Physics Project, contract number RII3-CT-2004-506078.
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