This line studies Quantum Chromodynamics, especially its perturbative aspects. Several approaches are used, such as effective field theories, chiral perturbation theory or phenomenological lagrangians, such as that of the resonance chiral theory. A variety of goals are pursued, for instance, the theoretical and phenomenological study of QCD in hadron colliders, the study of the hadronic phenomenology in the resonance region, such as in the hadron decays of the tau lepton or in the semileptonic decays of the D mesons and others.