Effective chiral Lagrangian from dual resonance models

The parameters of the effective chiral Lagrangian (EChL) of order $O\left(p^4\right)$ and $O\left(p^6\right)$ are extracted from the low-energy behavior of dual resonance models for $\pi \pi$ and $\pi K$ scattering amplitudes. We discuss the dual resonance models in the presence of spontaneous and explicit chiral symmetry breaking. The obtained parameters of the EChL are used to estimate chiral corrections up to sixth order to various low-energy characteristics of $\pi \pi$ and $\pi K$ scattering amplitudes.