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.
@article{arxiv.hep-ex/0006005,
title = {A search for charmonium states produced in central pp interactions at 450 GeV/c},
author = {The WA102 Collaboration and D. Barberis},
journal= {arXiv preprint arXiv:hep-ex/0006005},
year = {2008}
}