1 Introduction

We give a brief description of some theoretical models which incorporate vector mesons in low energy effective lagrangians, namely the massive Yang-Mills approach, the Hidden Symmetry scheme and the conventional Vector Meson Dominance (VMD) model. We calculate a number of vector meson decays using the above schemes with and without implementation of chiral loop contributions. This is done for several processes of the anomalous and non-anomalous type, like and , with and , some of which can be measurable at DANE . We then turn to describe how one can introduce SU(3)-breaking in the vector-meson sector of effective chiral lagrangians incorporating vector-mesons (VM) as (hidden symmetry) gauge fields. We show that it is possible to consistently describe SU(3) breaking effects in the masses (), couplings to the photon field () and to pseudoscalar pairs (), pseudoscalar decay-constants () and charge radii (), in terms of just two parameters. A thorough description of all the above quantities is further improved when working in the context of Chiral Perturbation Theory (ChPT). We also show how to extend this procedure to the sector containing the VVP vertices related to the anomaly. An improved description of and transitions is obtained.