A search for charmonium states produced in central pp interactions at   450 GeV/c
  A search for centrally produced charmonium states has been presented. There is no significant evidence for any charmonium production. An upper limit of 2 nb is found for the cross section of chic production using the decay chic(1P)-> J/psi gamma. 
The WA102 Collaboration, D. Barberis, et al