Dynamical picture for the exotic XYZ states

We present a dynamical approach for description of the multi-quark states that is based on an effective interaction Lagrangian describing the coupling of hadrons to their constituent quarks. First, we explore the consequences of treating the X (3872) meson as a tetraquark bound state. We calculate the decay widths of the observed channels and conclude that for reasonable values of the size parameter of the X (3872) one finds consistency with the available experimental data. Then we have critically checked the tetraquark picture for the Z c (3900) state by analyzing its strong decays. We found that Z c (3900) has a much more stronger coupling to DD* than to J/Ψπ that is in discord with experiment. As an alternative we have employed a molecular-type four-quark current to describe the decays of the Z c (3900) state as the charged particle in the isotriplet. We found that a molecular-type current gives the values of the above decays in accordance with the experimental observation. By using moleculartype four-quark currents for the recently observed resonances Z b (10610) and Z b (10650), we have calculated their two-body decay rates into a bottomonium state plus a light meson as well as into B-meson pairs.