  We study the mixing angle \theta_{O\psi} and mixing amplitude f_{O\psi} of
J/psi and vector glueball O, in the framework of potential models of heavy
quarks and constituent gluons.
  While the state vectors of J/psi and O are constructed from the wave
functions of few-body Schroedinger equations, the mixing dynamics is governed
by perturbative QCD.
  We obtain a value of the mixing angle of |\tan \theta_{O\psi}| \approx 0.015
and the mixing amplitude of |f_{O\psi}(m_{O\psi}^2)| \approx 0.008 GeV^2, which
is compatible with phenomenological analysis.
