Doubly Okubo-Zweig-Iizuka-rule--violating effects in J/psi decays

We analyze some of the existing data available for the hadronic and radiative production of mesons from the J/psi. A reanalysis of the decays into a pseudoscalar- and vector-meson pair indicates good agreement with the pseudoscalar mixing angle derived from the new two-photon widths of these mesons. An important ingredient is the inclusion of the doubly disconnected diagram, which also provides a natural mechanism for decays into a meson plus gluonium. We attempt to estimate the decay rate of J/psi into gluonium and mesons using the radiative decay widths as input. We also present a discussion of J/psi decays into tensor+vector and axial-vector+vector states