  A dynamical coupled-channel study of K* K*bar state with isospin 0 and omega
phi state is performed within both the chiral SU(3) quark model and the
extended chiral SU(3) quark model by solving a resonating group method (RGM)
equation. The model parameters are taken from our previous work, which gave a
satisfactory description of the energies of the octet and decuplet baryon
ground states, the binding energy of the deuteron, the nucleon-nucleon (NN)
scattering phase shifts, and the hyperon-nucleon (YN) cross sections. The
results show that the interactions of K* K*bar states are attractive, which
consequently result in K* K*bar bound states with the binding energies of about
10-70 MeV, and contrarily, no omega phi bound state is obtained. The channel
coupling effect of K* K*bar and omega phi is found to be considerably large,
which makes the binding of K* K*bar 5-45 MeV deeper. The plausible
interpretation of f_0(1710) and X(1812) being K* K*bar dominated states is
briefly discussed.
