Peláez Sagredo, José Ramón2023-06-192023-06-1920141742-65881742-658810.1088/1742-6596/562/1/012012https://hdl.handle.net/20.500.14352/33893© IOP Publishing Ltd. International Conference on Hadron Physics (TROIA) (4. 2014. Canakkale, Turquia). I thank the organizers of Troia14 for their kind hospitality and for creating such a nice scientific environment. Work supported by the Spanish Research contract FPA2011-27853-C02-02 and the EU-Research Infrastructure Integrating Activity “Study of Strongly Interacting Matter” (acronym HadronPhysics2, Grant Agreement n. 227431, 7th Framework Programme).In this talk I briefly review the status of the f(0)(500) and f(0)(980) together with the other light scalar resonances, as well as the emerging picture of a non-ordinary light meson multiplet, paying particular attention to unitarized Chiral Perturbation Theory, large N-c, semi-local duality and Regge theory arguments.engAtribución 3.0 Españahttps://creativecommons.org/licenses/by/3.0/es/journal articlehttp://dx.doi.org/10.1088/1742-6596/562/1/012012http://iopscience.iop.orgopen access51-73Chiral perturbation-theoryPi-pi scatteringLarge-n-cExtraordinary hadronsMultiquark hadronsSigma mesonOne-loopModelResonancesDecaysFísica matemática