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Resumen:
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Quantum Chromodynamics (QCD) is the fundamental theory that explains the strong interactions between quarks and gluons. Unfortunately, the fact that QCD is asymptotically free at short distances produces the confinement of quarks at low energies, creating the well known hadrons, which are then appropriate the degrees of freedom to extract information from. In order to overcome this difficulty, Weinberg introduced in 1979 [1] Chiral Perturbation Theory (ChPT). This is an effective field theory that considers the octet of pseudo-goldstone bosons (pions, kaons and eta) produced by the chiral symmetry breaking as the degrees of freedom and provides a systematiclow-energy expansion for the observables. Nevertheless, ChPT is not able to determine with high accuracy the low energy parameters of the meson-meson interactions, besides, its series expansion does not respect unitarity, and hence can only be applied very close to threshold...
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