Some considerations on the production mechanisms for the J and psi particles and charmed particles

The recent discovery of J and psi particles with anomalous properties, together with the theoretical expectation of charm related particles with predicted mass values accessible to the Fermilab range of energy, suggests that a reasonably systematic discussion of production mechanisms for these particles might be appropriate. We discuss here (a) hadron-initiated, (b) photoinitiated, and (c) lepton-initiated (l = e,μ) mechanisms for the production of these objects