Recent Charmonium Results form HERA-B

HERA-B is a fixed-target multi-particle spectrometer experiment at the 920 GeV HERA proton beam at DESY. Approximately 150 million events were recorded with a dilepton trigger during the 2002/2003 HERA run. About 300,000 leptonic J/ l + l - decays (170,000 in the + -channel and 130,000 in the e + e -channel) have been reconstructed in this data sample. In addition, a huge sample of 220 million minimum biased triggered events were recorded, allowing an independent measurement of the J/ production cross section. The dilepton triggered samples allow for the first time the study of charmonium production in the negative Feynman-x (xF ) region, and will provide an important input for testing the charmonium production mechanism. Results will be presented on the nuclear dependence of charmonium production, on J/, c and production and on their differential distributions. Furthermore, the first measurement of the nuclear suppression of charmonium production in the negative xF region will be presented.