Observation of a near-threshold omega-J/psi mass enhancement in   exclusive B-->K omega J/psi decays
  We report the observation of a near-threshold enhancement in the omega-J/psi invariant mass distribution for exclusive B-->K omega J/psi decays. The results are obtained from a 253 fb-1 data sample that contains 275 million BB-bar meson pairs that were collected near the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric energy e+e- collider. The statistical significance of the omega-J/psi mass enhancement is estimated to be greater than 8 sigma. 
S.-K. Choi, S.L. Olsen, et al. (for the Belle Collaboration)