Production of lepton pairs, J/ psi and charm with hadron beams

Data for J/ psi production with nucleon and pion beams are used, together with electroproduction data, to extract information about distributions of quarks within hadrons. These distributions are used to make further predictions about J/ psi production with beams of hadrons of various types, and about the production of lepton pairs. It is argued that, even at SPS or FNAL energies, J/ psi production does not usually involve the conjoint production of charmed particles. The production of charmed particles without the J/ psi is also considered; the cross section is estimated to be smaller than has been previously predicted. (27 refs).