Peláez Sagredo, José RamónHanhart, C.Nebreda Manjón, JeniferRios, G.2023-06-202023-06-202010978-0-7354-0807-410.1063/1.3483311https://hdl.handle.net/20.500.14352/45623©2010Amer Inst Physics. International Conference on Hadron Spectroscopy. (13. 2009. Tallahassee, Florida). J.R.P. thanks the organizers of Hadron2009 for the invitation and for their work to create such a pleasant but exciting conference. Work partially supported by Spanish Ministerio de Educación y Ciencia contracts: FPA2007-29115- E, FPA2008-00592 and FIS2006-03438, U.Complutense/Banco Santander grant PR34/07-15875-BSCH and UCMBSCH GR58/08 910309 and the European Community-Research Infrastructure Integrating Activity “Study of Strongly Interacting Matter” (HadronPhysics2, Grant Agreement n. 227431) under the Seventh Framework Programme of EU.In this talk we briefly review how the unitarization of Chiral Perturbation Theory with dispersion relations can successfully describe the meson- meson scattering data and generate light resonances, whose mass, width and nature can be related to QCD parameters like quark masses and the number of colors.engbook parthttp://dx.doi.org/10.1063/1.3483311http://scitation.aip.orgopen access51-73Twisted mass fermionsPion form-factorsScalar mesonsOne-loopLight quarksN-CScatteringParticlesResonanceA(0)(980)Física-Modelos matemáticosFísica matemática