Multiquark states in the covariant quark confinement model

Abstract

This talk reviews the last applications of the covariant qua rk model for studying the properties of the multiquark states: Bs−meson (quark-antiquark state), light baryons (three-quar k states) and tetraquark (four-quark state). The form factors of the B(Bs) → P(V)−transitions are evaluated in the full kinematical region of momentum transfer squared. The widths of some Bs−nonleptonic decays are calculated. The static properties of the proton a nd neutron, and the Λ-hyperon (magnetic moments and charge radii) and the behavior of the nucleon form factors at low momentum transfers are described. The consequences of treating the X(3872) meson as a tetraquark bound state are explored. The decay widths of the observed channels X → J/ψ + 2π(3π) and X → ¯