  The formation and spectrum of two-particle bound states are investigated
within a simple relativistic quantum field model with the Yukawa-type
interaction. Within this approach, relatively weakly interacting quarks and
gluons form stable bound states under the analytic confinement. By introducing
a minimal set of free parameters (the quark masses, the coupling constant and
the confinement 'radius') and by solving the Bethe-Salpeter equation with
one-gluon exchange, we satisfactorily explain the experimental data for most
known mesons and the glueball.
